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L_0060 | other objects in the solar system | T_0604 | FIGURE 25.35 Comet Hale-Bopp lit up the night sky in 1997. | image | textbook_images/other_objects_in_the_solar_system_20420.png |
L_0060 | other objects in the solar system | T_0607 | FIGURE 25.36 Ceres is a large spherical object in the asteroid belt. | image | textbook_images/other_objects_in_the_solar_system_20421.png |
L_0060 | other objects in the solar system | T_0607 | FIGURE 25.37 Pluto with its moons: Charon, Nix and Hydra. | image | textbook_images/other_objects_in_the_solar_system_20422.png |
L_0060 | other objects in the solar system | T_0608 | FIGURE 25.38 An artists drawing of what Haumea and its moons might look like. The moons are drawn closer to Haumea than their actual orbits. | image | textbook_images/other_objects_in_the_solar_system_20423.png |
L_0060 | other objects in the solar system | T_0609 | FIGURE 25.39 Makemake is a dwarf planet. | image | textbook_images/other_objects_in_the_solar_system_20424.png |
L_0060 | other objects in the solar system | T_0610 | FIGURE 25.40 Eris is the largest known dwarf planet, but its so far from the Sun that it wasnt discovered until 2005. | image | textbook_images/other_objects_in_the_solar_system_20425.png |
L_0061 | stars | T_0611 | FIGURE 26.1 Orion has three stars that make up his belt. Orions belt is fairly easy to see in the night sky. | image | textbook_images/stars_20426.png |
L_0061 | stars | T_0619 | FIGURE 26.2 Stars form in a nebula like this one in Orions sword. | image | textbook_images/stars_20427.png |
L_0061 | stars | T_0622 | FIGURE 26.3 A supernova, as seen by the Hubble Space Telescope. | image | textbook_images/stars_20428.png |
L_0061 | stars | T_0623 | FIGURE 26.4 An artists depiction of a neutron star. | image | textbook_images/stars_20429.png |
L_0062 | galaxies | T_0626 | FIGURE 26.6 These hot blue stars are in an open clus- ter known as the Jewel Box. The red star is a young red supergiant. | image | textbook_images/galaxies_20431.png |
L_0062 | galaxies | T_0626 | FIGURE 26.7 The globular cluster, M13, contains red and blue giant stars. | image | textbook_images/galaxies_20432.png |
L_0062 | galaxies | T_0628 | FIGURE 26.8 The Andromeda Galaxy is the closest ma- jor galaxy to our own. | image | textbook_images/galaxies_20433.png |
L_0062 | galaxies | T_0628 | FIGURE 26.9 The Pinwheel Galaxy is a spiral galaxy displaying prominent arms. | image | textbook_images/galaxies_20434.png |
L_0062 | galaxies | T_0629 | FIGURE 26.10 M87 is an elliptical galaxy in the lower left of this image. How many elliptical galaxies do you see? Are there other types of galaxies displayed? | image | textbook_images/galaxies_20435.png |
L_0062 | galaxies | T_0632 | FIGURE 26.11 This irregular galaxy, NGC 55, is neither spiral nor elliptical. | image | textbook_images/galaxies_20436.png |
L_0062 | galaxies | T_0632 | FIGURE 26.12 The Milky Way Galaxy in the night sky above Death Valley. | image | textbook_images/galaxies_20437.png |
L_0068 | types of rocks | T_0685 | FIGURE 4.1 The rock cycle. | image | textbook_images/types_of_rocks_20468.png |
L_0068 | types of rocks | T_0685 | FIGURE 4.2 Rocks contain many clues about the conditions in which they formed. The minerals contained within the rocks also contain geological information. | image | textbook_images/types_of_rocks_20469.png |
L_0068 | types of rocks | T_0686 | FIGURE 4.3 Lava is molten rock. This lava will harden into an igneous rock. | image | textbook_images/types_of_rocks_20470.png |
L_0068 | types of rocks | T_0686 | FIGURE 4.4 This sandstone is an example of a sedi- mentary rock. It formed when many small pieces of sand were cemented together to form a rock. | image | textbook_images/types_of_rocks_20471.png |
L_0068 | types of rocks | T_0687 | FIGURE 4.5 This mica schist is a metamorphic rock. It was changed from a sedimentary rock like shale. | image | textbook_images/types_of_rocks_20472.png |
L_0068 | types of rocks | DD_0044 | This diagram shows how rocks can change from one type to another when they undergo certain processes. For magma, when it solidifies, it becomes an igneous rock. Igneous rocks can then turn into metamorphic rocks when they undergo metamorphism. They can also turn back into magma when they undergo melting. Otherwise, when igneous rocks go through erosion, they become sediment. Sediment can also be obtained from metamorphic and sedimentary rocks when they undergo erosion, too. Sediments can then undergo lithification to become sedimentary rocks. Sedimentary rocks can also become metamorphic rocks when they undergo metamorphism. And finally, metamorphic rocks can turn into magma when they undergo melting. | image | teaching_images/cycle_rock_6744.png |
L_0068 | types of rocks | DD_0045 | The diagram shows types of rocks and rock formation cycles. There are three major rock types. Rock of any of these three rock types can become rock of one of the other rock types. All rocks on Earth change, but these changes usually happen very slowly. Some changes happen below Earths surface. Some changes happen above ground. Any type of rock can change and become a new type of rock. Magma can cool and crystallize. Existing rocks can be weathered and eroded to form sediments. Rock can change by heat or pressure deep in Earths crust. There are three main processes that can change rock: Cooling and forming crystals. Deep within the Earth, temperatures can get hot enough to melt rock. This molten material is called magma. As it cools, crystals grow, forming an igneous rock. The crystals will grow larger if the magma cools slowly, as it does if it remains deep within the Earth. If the magma cools quickly, the crystals will be very small. Weathering and erosion. Water, wind, ice, and even plants and animals all act to wear down rocks. Over time they can break larger rocks into smaller pieces called sediments. | image | teaching_images/cycle_rock_6723.png |
L_0068 | types of rocks | DD_0046 | The Rock Cycle illustrates how rocks continually change form. There are three basic types of rocks: igneous, sedimentary and metamorphic, and each of these rocks can be changed into any one of the other types. The names of the rock types refer to the way the rocks are formed. Arrows in the diagram display how one type of rock may change to another type of rock. All igneous rocks start out as melted rock(magma) and then crystallize, or freeze. When an igneous rock is exposed on the surface, it goes through the process of weathering and erosion that breaks the rock down into smaller pieces. Wind and water carry the smaller pieces of igneous rock into piles called sediment. Through the process of compaction and cementation, the sediment gets buried and the pieces of rock become cemented together to form a new type of rock called a sedimentary rock. If a sedimentary rock is exposed at the surface, it can be eroded away and eventually changed into a new sedimentary rock. However, if a sedimentary(or an igneous) rock gets buried deep in the Earth, heat and pressure will cause profound physical and/or chemical change. This process is called metamorphosis, and the new rock is called a metamorphic rock. Metamorphic rock can also be weathered and eroded and eventually changed into a sedimentary rock. Or, if a metamorphic rock is forced deeper into the Earth, the rock can melt and become magma. Igneous rock and sedimentary rock can also be forced deep into the Earth and melt into magma. Once magma cools, it forms igneous rocks again. | image | teaching_images/cycle_rock_6748.png |
L_0069 | igneous rocks | T_0688 | FIGURE 4.7 The Sierra Nevada of California are com- posed mainly of granite. These rocks are beautifully exposed in the Yosemite Valley. | image | textbook_images/igneous_rocks_20474.png |
L_0069 | igneous rocks | T_0688 | FIGURE 4.8 (A) This granite has more plagioclase feldspar than many granites. (B) Dior- ite has more dark-colored minerals than granite. (C) Gabbro. (D) Peridotite is an intrusive igneous rock with olivine and other mafic minerals. rapid cooling time does not allow time for large crystals to form. Some extrusive igneous rocks cool so rapidly that crystals do not develop at all. These form a glass, such as obsidian. Others, such as pumice, contain holes where gas bubbles were trapped in the lava. The holes make pumice so light that it actually floats in water. The most common extrusive igneous rock is basalt. It is the rock that makes up the ocean floor. Figure 4.10 shows four types of extrusive igneous rocks. | image | textbook_images/igneous_rocks_20475.png |
L_0069 | igneous rocks | T_0688 | FIGURE 4.9 (A) Lava cools to form extrusive igneous rock. The rocks here are basalts. (B) The strange rock formations of Chiricahua National Monument in Arizona are formed of the extrusive igneous rock rhyolite. | image | textbook_images/igneous_rocks_20477.png |
L_0069 | igneous rocks | T_0688 | FIGURE 4.10 (A) This rhyolite is light colored. Few minerals are visible to the naked eye. (B) Andesite is darker than rhyolite. (C) Since basalt crystals are too small to see, the rock looks dark all over. (D) Komatiite is a very rare ultramafic rock. This rock is derived from the mantle. | image | textbook_images/igneous_rocks_20476.png |
L_0069 | igneous rocks | T_0689 | FIGURE 4.11 This sarcophagus is housed at the Vat- ican Museum. The rock is the igneous extrusive rock porphyry. Porphyry has large crystals because the magma began to cool slowly, then erupted. | image | textbook_images/igneous_rocks_20478.png |
L_0070 | sedimentary rocks | T_0690 | FIGURE 4.13 Cobbles, pebbles, and sands are the sediments that are seen on this beach. | image | textbook_images/sedimentary_rocks_20480.png |
L_0071 | metamorphic rocks | T_0694 | FIGURE 4.14 (A) Hornfels is a rock that is created by contact metamorphism. (B) Hornfels is so hard that it can create peaks like the Matterhorn. | image | textbook_images/metamorphic_rocks_20481.png |
L_0071 | metamorphic rocks | T_0694 | FIGURE 4.15 (A) Regional metamorphic rocks often display layering called foliation. (B) Re- gional metamorphism with high pressures and low temperatures can result in blue schist. | image | textbook_images/metamorphic_rocks_20482.png |
L_0071 | metamorphic rocks | T_0695 | FIGURE 4.16 (A) Marble is a beautiful rock that is com- monly used for buildings. (B) Many of the great statues of the Renaissance were carved from marble. Michelangelo cre- ated this Moses between 1513 and 1515. | image | textbook_images/metamorphic_rocks_20483.png |
L_0072 | earths energy | T_0702 | FIGURE 5.1 Kicking a soccer ball takes energy from your food and gives it to the soccer ball. | image | textbook_images/earths_energy_20484.png |
L_0072 | earths energy | T_0704 | FIGURE 5.2 Rechargeable batteries are renewable because they can be refilled with energy. Is the energy they are refilled with always renewable? | image | textbook_images/earths_energy_20485.png |
L_0073 | nonrenewable energy resources | T_0712 | FIGURE 5.3 Coal is a solid hydrocarbon formed from decaying plant material over millions of years. | image | textbook_images/nonrenewable_energy_resources_20486.png |
L_0073 | nonrenewable energy resources | T_0717 | FIGURE 5.4 This oil refinery processes crude oil into usable energy sources, such as gasoline. | image | textbook_images/nonrenewable_energy_resources_20487.png |
L_0073 | nonrenewable energy resources | T_0725 | FIGURE 5.5 Burning fossil fuels releases pollutants into the air. | image | textbook_images/nonrenewable_energy_resources_20488.png |
L_0073 | nonrenewable energy resources | T_0728 | FIGURE 5.6 Nuclear power plants like this one provide France with almost 80% of its electricity. | image | textbook_images/nonrenewable_energy_resources_20489.png |
L_0074 | renewable energy resources | T_0731 | FIGURE 5.7 Solar energy is clean and renewable. So- lar panels are needed to collect the sun- light for use. | image | textbook_images/renewable_energy_resources_20490.png |
L_0074 | renewable energy resources | T_0735 | FIGURE 5.8 A solar power tower is used to concen- trate the solar energy collected by many solar panels. | image | textbook_images/renewable_energy_resources_20491.png |
L_0074 | renewable energy resources | T_0735 | FIGURE 5.9 Solar panels on top of a car could power the car. This technology is a long way from being practical. | image | textbook_images/renewable_energy_resources_20492.png |
L_0074 | renewable energy resources | T_0736 | FIGURE 5.10 Glen Canyon Dam harnesses the power of flowing water to generate electricity. | image | textbook_images/renewable_energy_resources_20493.png |
L_0074 | renewable energy resources | T_0741 | FIGURE 5.11 Winds are funneled through passes in mountain ranges. Altamont Pass in Cal- ifornia is the site of many wind turbines. | image | textbook_images/renewable_energy_resources_20494.png |
L_0076 | continental drift | T_0762 | FIGURE 6.7 Wegener used fossil evidence to sup- port his continental drift hypothesis. The fossils of these organisms are found on lands that are now far apart. Wegener suggested that when the organisms were alive, the lands were joined and the or- ganisms were living side-by-side. | image | textbook_images/continental_drift_20501.png |
L_0076 | continental drift | T_0763 | FIGURE 6.8 Earths magnetic field is like a magnet with its north pole near the geographic north pole and the south pole near the geographic south pole. Anywhere lavas have cooled, these magnetite crystals point to the magnetic poles. The little magnets point to where the north pole was when the lava cooled. Scientists can use this to figure out where the continents were at that time. This evidence clearly shows that the continents have moved. During Wegeners life, scientists did not know how the continents could move. Wegeners idea was nearly forgotten. But as more evidence mounted, new ideas came about. | image | textbook_images/continental_drift_20502.png |
L_0076 | continental drift | DD_0054 | The diagram shows the changes of Pangaea, which is a supercontinent of continents on the earth. The left upper subfigure shows the configuration of Pangaea in 200 million years ago. The right upper subfigure shows the configuration of Pangaea in 180 million years ago. The left lower subfigure shows the configuration of Pangaea in 65 million years ago. The right lower subfigure shows the current configuration of Pangea. | image | teaching_images/continental_drift_8043.png |
L_0076 | continental drift | DD_0055 | This diagram shows one of the pillars of Wegener's theory of the previous existence of Pangaea: the localization of fossils. Fossils are the remains or impression of prehistoric animals. Many fossils of the same organisms have been found on widely separated places. Wegener thought the existence of Pangaea allowed movement to said organisms that would be impossible nowadays. The diagram shows the area where some species had lived and the suspected routes allowed by the existence of the supercontinent. | image | teaching_images/continental_drift_8044.png |
L_0076 | continental drift | DD_0056 | The diagram shows how the earth looked according to the continental drift hypothesis. All of the continents were fused together as one big land mass called pangaea. Panthalassa was the vast global ocean that surrounded the supercontinent Pangaea. Gondwana is the part of Pangaea that lay in the Southern Hemisphere. Gondwana included most of the landmasses in today's Southern Hemisphere- South America, Africa, India, Australia, and Antarctica.The part of Pangaea that lay in the Northern Hemisphere was called Laurasia. It included most of the present-day North America, Greenland, Europe, and Asia. Tethys Sea was an ocean that existed between the continents of Gondwana and Laurasia.
| image | teaching_images/continental_drift_9081.png |
L_0079 | stress in earths crust | T_0793 | FIGURE 7.1 Stress caused these rocks to fracture. | image | textbook_images/stress_in_earths_crust_20523.png |
L_0079 | stress in earths crust | T_0794 | FIGURE 7.2 This rock has undergone shearing. The pencil is pointing to a line. Stresses forced rock on either side of that line to go in opposite directions. | image | textbook_images/stress_in_earths_crust_20524.png |
L_0079 | stress in earths crust | T_0794 | FIGURE 7.3 With increasing stress, the rock deforms and may eventually fracture. | image | textbook_images/stress_in_earths_crust_20525.png |
L_0079 | stress in earths crust | T_0795 | FIGURE 7.4 Layers of different types of rocks are ex- posed in this photo from Grand Staircase- Escalante National Monument. White lay- ers of limestone are hard and form cliffs. Red layers of shale are flakier and form slopes. | image | textbook_images/stress_in_earths_crust_20526.png |
L_0079 | stress in earths crust | T_0795 | FIGURE 7.5 Joints in this granite created a zone of weakness. The rock below the joints fell, leaving scars in this hillside. | image | textbook_images/stress_in_earths_crust_20527.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.6 This is a geologic cross section of the Grand Staircase in Utah. A small fold, called an syncline, is revealed at the left of the diagram. | image | textbook_images/stress_in_earths_crust_20528.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.7 The rock layers in the center right are tilted in one direction, forming a mono- cline. | image | textbook_images/stress_in_earths_crust_20529.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.8 An anticline is a convex upward fold, as shown in (A). An anticline is well displayed in (B), which was taken at Calico Ghost Town, California. | image | textbook_images/stress_in_earths_crust_20530.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.9 (A) A syncline is a concave downward fold. (B) This syncline is seen at Calico Ghost Town near Barstow, California. | image | textbook_images/stress_in_earths_crust_20533.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.10 Joints in boulders in the Arizona desert. The rock on either side of the joints has not moved. | image | textbook_images/stress_in_earths_crust_20531.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.11 (A) This image shows a small fault. The black rock layer is not a line because a fault has broken it. Rock on each side of the fault has moved. (B) A large fault runs between the lighter colored rock on the left and the darker colored rock on the right. There has been so much movement along the fault that the darker rock doesnt resemble anything around it. the faults dip. If the fault dips at an angle, the fault is a dip-slip fault. Imagine you are standing on a road looking at the fault. The hanging wall is the rock that overlies the fault, while the footwall is beneath the fault. If you are walking along a fault, the hanging wall is above you and the footwall is where your feet would be. Miners often extract mineral resources along faults. They used to hang their lanterns above their heads. That is why these layers were called the hanging wall. In normal faults, the hanging wall drops down relative to the footwall. Normal faults are caused by tension that pulls the crust apart, causing the hanging wall to slide down. Normal faults can build huge mountain ranges in regions experiencing tension (Figure 7.12). | image | textbook_images/stress_in_earths_crust_20532.png |
L_0079 | stress in earths crust | T_0796 | FIGURE 7.12 The Teton Range in Wyoming rose up along a normal fault. | image | textbook_images/stress_in_earths_crust_20534.png |
L_0079 | stress in earths crust | T_0798 | FIGURE 7.13 In this thrust fault, the rock on the left is thrust over the rock on the right. | image | textbook_images/stress_in_earths_crust_20535.png |
L_0079 | stress in earths crust | T_0798 | FIGURE 7.14 Diagram of strike-slip faults. | image | textbook_images/stress_in_earths_crust_20536.png |
L_0079 | stress in earths crust | T_0798 | FIGURE 7.15 The San Andreas Fault is visible from the air in some locations. This transform fault separates the Pacific plate on the west and the North American plate on the east. | image | textbook_images/stress_in_earths_crust_20537.png |
L_0079 | stress in earths crust | T_0800 | FIGURE 7.16 As India rams into Eurasia, the Himalaya Mountains rise. | image | textbook_images/stress_in_earths_crust_20538.png |
L_0079 | stress in earths crust | T_0802 | FIGURE 7.17 The Himalayas. | image | textbook_images/stress_in_earths_crust_20539.png |
L_0079 | stress in earths crust | T_0802 | FIGURE 7.18 Cotopaxi is in the Andes Mountains of Ecuador. The 19,300 foot tall mountain is the highest active volcano in the world. | image | textbook_images/stress_in_earths_crust_20540.png |
L_0079 | stress in earths crust | T_0802 | FIGURE 7.19 This diagram shows how a basin-and- range forms. | image | textbook_images/stress_in_earths_crust_20541.png |
L_0079 | stress in earths crust | DD_0063 | Rocks are present all over earth and sometimes stress causes damage to them. Stress can occur to rocks when force is applied to them. There are four types of rock stresses. They are: confining stress, compression stress, tension stress and shear stress. Confining stress occurs when other rocks push down on a rock below them. Compression stress occurs when rocks are pressed together. Tension stress occurs when rocks are forced apart. Shear stress occurs when two or more rocks are forced in opposite directions. | image | teaching_images/faults_1737.png |
L_0079 | stress in earths crust | DD_0064 | The diagram shows different types of geological faults. Reverse fault is the geologic fault in which the hanging wall has moved upward relative to the footwall. Hanging wall is the block of rock that lies above an inclined fault while footwall is the block of rock that lies on the underside of an inclined fault. Reverse faults occur where two blocks of rock are forced together by compression. Normal fault is the geologic fault in which the hanging wall has moved downward relative to the footwall. Normal faults occur where two blocks of rock are pulled apart, as by tension. Strike-slip fault is the geologic fault in which the blocks of rock on either side of the fault slide horizontally in opposite directions along the line of the fault plane. | image | teaching_images/faults_186.png |
L_0079 | stress in earths crust | DD_0065 | The image below shows different types of faults. A fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock mass movement. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. In strike-slip faults the fault surface is usually near vertical and the footwall moves either left or right or laterally with very little vertical motion. Strike-slip faults with left-lateral motion are also known as sinistral faults. In a normal fault, the block above the fault moves down relative to the block below the fault. This fault motion is caused by tensional forces and results in extension. | image | teaching_images/faults_1747.png |
L_0086 | igneous landforms and geothermal activ | T_0865 | FIGURE 8.20 The Mono Craters in California are lava domes. | image | textbook_images/igneous_landforms_and_geothermal_activ_20584.png |
L_0086 | igneous landforms and geothermal activ | T_0866 | FIGURE 8.21 Lava erupts into the Pacific Ocean in Hawaii, creating new land. | image | textbook_images/igneous_landforms_and_geothermal_activ_20585.png |
L_0086 | igneous landforms and geothermal activ | T_0867 | FIGURE 8.22 The granite intrusions that form the Sierra Nevada in California are well exposed. | image | textbook_images/igneous_landforms_and_geothermal_activ_20586.png |
L_0087 | weathering | T_0872 | FIGURE 9.1 A hard winter has damaged this road. | image | textbook_images/weathering_20588.png |
L_0087 | weathering | T_0873 | FIGURE 9.2 Diagram showing ice wedging. Ice wedging happens because water expands as it goes from liquid to solid. When the temperature is warm, water works its way into cracks in rock. When the temperature cools below freezing, the water turns to ice and expands. The ice takes up more space. Over time, this wedges the rock apart. Ice wedging is very effective at weathering. You can find large piles of broken rock at the base of a slope. These rocks were broken up by ice wedging. Once loose, they tumbled down the slope. | image | textbook_images/weathering_20589.png |
L_0087 | weathering | T_0874 | FIGURE 9.3 Rocks on a beach are worn down by abrasion as passing waves cause them to strike each other. | image | textbook_images/weathering_20590.png |
L_0087 | weathering | T_0881 | FIGURE 9.4 Iron ore oxidizes readily. | image | textbook_images/weathering_20591.png |
L_0087 | weathering | T_0881 | FIGURE 9.5 Devils Tower shows differential weather- ing. Hard rock from inside a volcano makes up the tower. | image | textbook_images/weathering_20592.png |
L_0089 | acid rain | T_0901 | FIGURE 1.1 Tall smokestacks allow the emissions to rise high into the atmosphere and travel up to 1,000 km (600 miles) downwind. | image | textbook_images/acid_rain_20602.png |
L_0089 | acid rain | T_0901 | FIGURE 1.2 Pollutants are deposited dry or in precipi- tation. | image | textbook_images/acid_rain_20603.png |
L_0089 | acid rain | T_0901 | FIGURE 1.3 | image | textbook_images/acid_rain_20604.png |
L_0089 | acid rain | T_0902 | FIGURE 1.4 | image | textbook_images/acid_rain_20605.png |
L_0090 | adaptation and evolution of populations | T_0905 | FIGURE 1.1 Click image to the left or use the URL below. URL: https://www.ck12.org/flx/render/embeddedobject/186577 | image | textbook_images/adaptation_and_evolution_of_populations_20606.png |
L_0092 | agriculture and human population growth | T_0909 | FIGURE 1.1 In a hunter-gatherer society, people relied on the resources they could find where they lived. | image | textbook_images/agriculture_and_human_population_growth_20607.png |
L_0092 | agriculture and human population growth | T_0910 | FIGURE 1.2 | image | textbook_images/agriculture_and_human_population_growth_20608.png |
L_0092 | agriculture and human population growth | T_0910 | FIGURE 1.3 Farming has increasingly depended on machines. Such advanced farming prac- tices allow one farmer to feed many more people than in the past. | image | textbook_images/agriculture_and_human_population_growth_20609.png |
L_0092 | agriculture and human population growth | T_0911 | FIGURE 1.4 Early in the Industrial Revolution, large numbers of people who had been freed from food production were available to work in factories. | image | textbook_images/agriculture_and_human_population_growth_20610.png |
L_0092 | agriculture and human population growth | T_0912 | FIGURE 1.5 | image | textbook_images/agriculture_and_human_population_growth_20611.png |
L_0094 | air quality | T_0921 | FIGURE 1.1 | image | textbook_images/air_quality_20614.png |
L_0094 | air quality | T_0922 | FIGURE 1.2 | image | textbook_images/air_quality_20615.png |
L_0095 | asteroids | T_0926 | FIGURE 1.1 | image | textbook_images/asteroids_20616.png |
L_0095 | asteroids | T_0926 | FIGURE 1.2 | image | textbook_images/asteroids_20617.png |
L_0095 | asteroids | T_0927 | FIGURE 1.3 | image | textbook_images/asteroids_20618.png |
L_0095 | asteroids | T_0928 | FIGURE 1.4 | image | textbook_images/asteroids_20619.png |
L_0096 | availability of natural resources | T_0932 | FIGURE 1.1 | image | textbook_images/availability_of_natural_resources_20620.png |
L_0096 | availability of natural resources | T_0934 | FIGURE 1.2 | image | textbook_images/availability_of_natural_resources_20621.png |
L_0096 | availability of natural resources | T_0934 | FIGURE 1.3 | image | textbook_images/availability_of_natural_resources_20622.png |
L_0098 | bathymetric evidence for seafloor spreading | T_0939 | FIGURE 1.1 | image | textbook_images/bathymetric_evidence_for_seafloor_spreading_20626.png |
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