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NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3945 | image | textbook_images/behavior_of_gases_22544.png | FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why? | 0.338857 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_4470 | image | textbook_images/gases_22861.png | FIGURE 1.2 | 0.328407 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | DQ_011501 | image | question_images/states_of_matter_7614.png | states_of_matter_7614.png | 0.325477 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | DQ_002681 | image | question_images/radioactive_decay_7516.png | radioactive_decay_7516.png | 0.313298 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3944 | image | textbook_images/solids_liquids_gases_and_plasmas_22541.png | FIGURE 4.8 Kinetic energy is needed to overcome the force of attraction between particles of the same substance. | 0.304017 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_4451 | image | textbook_images/freezing_22849.png | FIGURE 1.1 | 0.303734 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | DQ_002744 | image | question_images/radioactive_decay_8182.png | radioactive_decay_8182.png | 0.303608 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_4740 | image | textbook_images/pressure_in_fluids_23030.png | FIGURE 1.3 | 0.29846 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3624 | image | textbook_images/buoyancy_of_fluids_22302.png | FIGURE 15.12 Fluid pressure exerts force on all sides of this object, but the force is greater at the bottom of the object where the fluid is deeper. | 0.295324 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_0207 | image | textbook_images/the_atmosphere_20136.png | FIGURE 15.4 This drawing represents a column of air. The column rises from sea level to the top of the atmosphere. Where does air have the greatest density? | 0.294936 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3946 | text | null | For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them. | 0.746868 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3941 | text | null | Why do different states of matter have different properties? Its because of differences in energy at the level of atoms and molecules, the tiny particles that make up matter. | 0.729404 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_0205 | text | null | We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density. | 0.728466 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3960 | text | null | Solids that change to gases generally first pass through the liquid state. However, sometimes solids change directly to gases and skip the liquid state. The reverse can also occur. Sometimes gases change directly to solids. | 0.723531 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_4715 | text | null | Compare and contrast the basic properties of matter, such as mass and volume. | 0.723152 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3801 | text | null | Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency. | 0.721365 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_0726 | text | null | Nuclear energy is produced by splitting the nucleus of an atom. This releases a huge amount of energy. | 0.721207 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3970 | text | null | The number of protons per atom is always the same for a given element. However, the number of neutrons may vary, and the number of electrons can change. | 0.714161 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_2746 | text | null | Like all organisms, bacteria need energy, and they can acquire this energy through a number of different ways. | 0.714009 |
NDQ_015187 | If particles of a gas have room to spread out, they exert greater pressure. | null | a. true, b. false | b | T_3939 | text | null | Water vapor is an example of a gas. A gas is matter that has neither a fixed volume nor a fixed shape. Instead, a gas takes both the volume and the shape of its container. It spreads out to take up all available space. You can see an example in Figure 4.6. | 0.712503 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4633 | image | textbook_images/modern_periodic_table_22960.png | FIGURE 1.2 | 0.349518 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | DQ_011501 | image | question_images/states_of_matter_7614.png | states_of_matter_7614.png | 0.330529 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | DQ_011497 | image | question_images/states_of_matter_7613.png | states_of_matter_7613.png | 0.321751 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4432 | image | textbook_images/evaporation_22833.png | FIGURE 1.1 | 0.320739 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_3945 | image | textbook_images/behavior_of_gases_22544.png | FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why? | 0.31704 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4470 | image | textbook_images/gases_22861.png | FIGURE 1.2 | 0.314754 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4834 | image | textbook_images/scientific_theory_23070.png | FIGURE 1.1 | 0.31451 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4279 | image | textbook_images/convection_22749.png | FIGURE 1.1 | 0.311172 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_3927 | image | textbook_images/types_of_matter_22524.png | FIGURE 3.10 Water is a compound that forms molecules. Each water molecule consists of two atoms of hydrogen (white) and one atom of oxygen (red). | 0.310208 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4054 | image | textbook_images/types_of_chemical_reactions_22614.png | FIGURE 8.9 A decomposition reaction occurs when an electric current passes through water. | 0.309708 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_0024 | text | null | Flowing water slows down when it reaches flatter land or flows into a body of still water. What do you think happens then? The water starts dropping the particles it was carrying. As the water slows, it drops the largest particles first. The smallest particles settle out last. | 0.670812 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_3939 | text | null | Water vapor is an example of a gas. A gas is matter that has neither a fixed volume nor a fixed shape. Instead, a gas takes both the volume and the shape of its container. It spreads out to take up all available space. You can see an example in Figure 4.6. | 0.662868 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_3946 | text | null | For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them. | 0.659421 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_1277 | text | null | Water sometimes comes into contact with hot rock. The water may emerge at the surface as either a hot spring or a geyser. | 0.655448 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4893 | text | null | A given kind of matter has the same chemical makeup and the same chemical properties regardless of its state. Thats because state of matter is a physical property. As a result, when matter changes state, it doesnt become a different kind of substance. For example, water is still water whether it exists as ice, liquid water, or water vapor. | 0.650765 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_4018 | text | null | Water (H2 O) is an example of a chemical compound. Water molecules always consist of two atoms of hydrogen and one atom of oxygen. Like water, all other chemical compounds consist of a fixed ratio of elements. It doesnt matter how much or how little of a compound there is. It always has the same composition. | 0.649584 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_0133 | text | null | Did you ever wonder where the water in your glass came from or where its been? The next time you take a drink of water, think about this. Each water molecule has probably been around for billions of years. Thats because Earths water is constantly recycled. | 0.64213 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_3960 | text | null | Solids that change to gases generally first pass through the liquid state. However, sometimes solids change directly to gases and skip the liquid state. The reverse can also occur. Sometimes gases change directly to solids. | 0.639036 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_0721 | text | null | Natural gas is mostly methane. | 0.636493 |
NDQ_015188 | Gas bubbles in water get bigger when they are under less pressure. | null | a. true, b. false | a | T_1674 | text | null | Remember that H2 O is a polar molecule, so it can dissolve many substances (Figure 1.1). Salts, sugars, acids, bases, and organic molecules can all dissolve in water. | 0.63649 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_3618 | image | textbook_images/pressure_of_fluids_22296.png | FIGURE 15.6 This graph shows how air pressure de- creases with increasing altitude. the air pressure on the surface of the drink. Because fluid flows from an area of high to low pressure, the drink moves up the straw and into your mouth. When you breathe, a muscle called the diaphragm causes the rib cage and lungs to expand or contract. When they expand, the air in the lungs is under less pressure than the air outside the body, so air flows into the lungs. When the ribs and lungs contract, air in the lungs is under greater pressure than air outside the body, so air flows out of the lungs. | 0.338734 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_4114 | image | textbook_images/air_pressure_and_altitude_22656.png | FIGURE 1.1 | 0.333653 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0207 | image | textbook_images/the_atmosphere_20136.png | FIGURE 15.4 This drawing represents a column of air. The column rises from sea level to the top of the atmosphere. Where does air have the greatest density? | 0.332617 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_3617 | image | textbook_images/pressure_of_fluids_22294.png | FIGURE 15.4 The pressure of ocean water increases rapidly as the water gets deeper. | 0.317876 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | DQ_010969 | image | question_images/convection_of_air_6662.png | convection_of_air_6662.png | 0.307429 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_3945 | image | textbook_images/behavior_of_gases_22544.png | FIGURE 4.11 Earths atmosphere exerts pressure. This pressure is greatest at sea level. Can you explain why? | 0.306026 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_4686 | image | textbook_images/oceanic_pressure_22994.png | FIGURE 1.1 | 0.304175 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | DQ_000358 | image | question_images/tides_149.png | tides_149.png | 0.303547 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_3800 | image | textbook_images/properties_of_electromagnetic_waves_22425.png | FIGURE 21.4 Light slows down when it enters water from the air. This causes the wave to refract, or bend. | 0.301175 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | DQ_000382 | image | question_images/tides_2608.png | tides_2608.png | 0.292054 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_1578 | text | null | The atmosphere has different properties at different elevations above sea level, or altitudes. | 0.742283 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0251 | text | null | Humidity is the amount of water vapor in the air. High humidity increases the chances of clouds and precipitation. | 0.695868 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0229 | text | null | Air temperature in the stratosphere layer increases with altitude. Why? The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun. The air at the bottom of the stratosphere is cold. The cold air is dense, so it doesnt rise. As a result, there is little mixing of air in this layer. | 0.690034 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0916 | text | null | Air masses are slowly pushed along by high-level winds. When an air mass moves over a new region, it shares its temperature and humidity with that region. So the temperature and humidity of a particular location depends partly on the characteristics of the air mass that sits over it. | 0.67919 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_1235 | text | null | The high and low pressure areas created by the six atmospheric circulation cells also determine in a general way the amount of precipitation a region receives. Rain is common in low pressure regions due to rising air. Air sinking in high pressure areas causes evaporation; these regions are usually dry. These features have a great deal of influence on climate. | 0.677905 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0205 | text | null | We usually cant sense the air around us unless it is moving. But air has the same basic properties as other matter. For example, air has mass, volume and, of course, density. | 0.66864 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0262 | text | null | An air mass is a large body of air that has about the same conditions throughout. For example, an air mass might have cold dry air. Another air mass might have warm moist air. The conditions in an air mass depend on where the air mass formed. | 0.666553 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_1753 | text | null | The atmosphere is layered, corresponding with how the atmospheres temperature changes with altitude. By under- standing the way temperature changes with altitude, we can learn a lot about how the atmosphere works. | 0.666304 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_0959 | text | null | The short term cycling of carbon begins with carbon dioxide (CO2 ) in the atmosphere. | 0.664116 |
NDQ_015189 | Air pressure is lowest at sea level. | null | a. true, b. false | b | T_3801 | text | null | Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency. | 0.662538 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | DQ_010978 | image | question_images/convection_of_air_8045.png | convection_of_air_8045.png | 0.327521 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4470 | image | textbook_images/gases_22861.png | FIGURE 1.2 | 0.324555 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | DQ_011501 | image | question_images/states_of_matter_7614.png | states_of_matter_7614.png | 0.313223 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4633 | image | textbook_images/modern_periodic_table_22960.png | FIGURE 1.2 | 0.307794 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4058 | image | textbook_images/types_of_chemical_reactions_22616.png | FIGURE 8.11 The blue flame on this gas stove is pro- duced when natural gas burns. | 0.297716 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4255 | image | textbook_images/combustion_reactions_22735.png | FIGURE 1.2 | 0.297234 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4279 | image | textbook_images/convection_22749.png | FIGURE 1.1 | 0.29694 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | DQ_010985 | image | question_images/convection_of_air_8047.png | convection_of_air_8047.png | 0.295491 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | DQ_010990 | image | question_images/convection_of_air_8049.png | convection_of_air_8049.png | 0.2953 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4451 | image | textbook_images/freezing_22849.png | FIGURE 1.1 | 0.292211 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_0216 | text | null | Energy travels through space or material. Heat energy is transferred in three ways: radiation, conduction, and convection. | 0.729216 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_0721 | text | null | Natural gas is mostly methane. | 0.726963 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_0700 | text | null | Energy is the ability to do work. Fuel stores energy and can be released to do work. Heat is given off when fuel is burned. | 0.722259 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_4715 | text | null | Compare and contrast the basic properties of matter, such as mass and volume. | 0.720909 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_3946 | text | null | For a given amount of gas, scientists have discovered that the pressure, volume, and temperature of a gas are related in certain ways. Because these relationships always hold in nature, they are called laws. The laws are named for the scientists that discovered them. | 0.712067 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_3941 | text | null | Why do different states of matter have different properties? Its because of differences in energy at the level of atoms and molecules, the tiny particles that make up matter. | 0.709685 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_0460 | text | null | Most pollutants enter the air when fossil fuels burn. Some are released when forests burn. Others evaporate into the air. | 0.709504 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_3960 | text | null | Solids that change to gases generally first pass through the liquid state. However, sometimes solids change directly to gases and skip the liquid state. The reverse can also occur. Sometimes gases change directly to solids. | 0.707386 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_0959 | text | null | The short term cycling of carbon begins with carbon dioxide (CO2 ) in the atmosphere. | 0.703454 |
NDQ_015190 | Heating a gas causes its particles to move more slowly. | null | a. true, b. false | b | T_2746 | text | null | Like all organisms, bacteria need energy, and they can acquire this energy through a number of different ways. | 0.701691 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_3949 | image | textbook_images/behavior_of_gases_22549.png | FIGURE 4.16 A tire pressure gauge measures the pressure of the air inside a car tire. Why is the pressure likely to increase as the car is driven? | 0.347492 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_4455 | image | textbook_images/friction_22852.png | FIGURE 1.1 | 0.268407 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | DD_0212 | image | teaching_images/convection_of_air_8050.png | This diagram shows convection currents. Convection is the transfer of heat from one place to another by the movement of fluids. The heat source lies at the bottom of the diagram. The heat generated by this source causes the air next to it, to warm up. Warm air is lighter than cool air, and hence it rises up. As it rises up, it moves away from the heat source and cools down. As it cools down, it gets heavier and sinks towards the heat source. This cycle continues and causes a convection current. | 0.268016 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_3947 | image | textbook_images/behavior_of_gases_22545.png | FIGURE 4.12 As the volume of a gas increases, its pressure decreases. | 0.261524 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_3949 | image | textbook_images/behavior_of_gases_22548.png | FIGURE 4.15 As the temperature of a gas increases, its pressure increases as well. | 0.253884 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0219 | image | textbook_images/energy_in_the_atmosphere_20141.png | FIGURE 15.9 Convection currents are the main way that heat moves through the atmosphere. Why does warm air rise? | 0.251768 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | DQ_010972 | image | question_images/convection_of_air_6663.png | convection_of_air_6663.png | 0.247353 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_3905 | image | textbook_images/generating_and_using_electricity_22508.png | FIGURE 25.9 This simple setup shows how electromagnetic induction occurs. | 0.247296 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0287 | image | textbook_images/weather_forecasting_20178.png | FIGURE 16.23 The greater the air pressure outside the tube, the higher the mercury rises inside the tube. Mercury can rise in the tube because theres no air pressing down on it. | 0.246992 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | DQ_010987 | image | question_images/convection_of_air_8048.png | convection_of_air_8048.png | 0.246783 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0959 | text | null | The short term cycling of carbon begins with carbon dioxide (CO2 ) in the atmosphere. | 0.67266 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_1797 | text | null | The two types of air pollutants are primary pollutants, which enter the atmosphere directly, and secondary pollutants, which form from a chemical reaction. | 0.648267 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0453 | text | null | Poor air quality started to become a serious problem after the Industrial Revolution. The machines in factories burned coal. This released a lot of pollutants into the air. After 1900, motor vehicles became common. Cars and trucks burn gasoline, which adds greatly to air pollution. | 0.640974 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_3801 | text | null | Although all electromagnetic waves travel at the same speed, they may differ in their wavelength and frequency. | 0.638577 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0229 | text | null | Air temperature in the stratosphere layer increases with altitude. Why? The stratosphere gets most of its heat from the Sun. Therefore, its warmer closer to the Sun. The air at the bottom of the stratosphere is cold. The cold air is dense, so it doesnt rise. As a result, there is little mixing of air in this layer. | 0.63765 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_4533 | text | null | A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the energy to do work. In a car, the engine does the work of providing kinetic energy that turns the wheels. The combustion engine in a car is a type of engine called an internal combustion engine. (Another type of combustion engine is an external combustion engine.) | 0.636115 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0251 | text | null | Humidity is the amount of water vapor in the air. High humidity increases the chances of clouds and precipitation. | 0.635648 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_0460 | text | null | Most pollutants enter the air when fossil fuels burn. Some are released when forests burn. Others evaporate into the air. | 0.634484 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_4536 | text | null | Most cars have at least four cylinders connected to the crankshaft. Their pistons move up and down in sequence, one after the other. A powerful car may have eight pistons, and some race cars may have even more. The more cylinders a car engine has, the more powerful its engine can be. | 0.628387 |
NDQ_015191 | Air pressure in a tire increases after you start driving because the air gets warmer. | null | a. true, b. false | a | T_1753 | text | null | The atmosphere is layered, corresponding with how the atmospheres temperature changes with altitude. By under- standing the way temperature changes with altitude, we can learn a lot about how the atmosphere works. | 0.628258 |
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