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3,300
NDQ_000021
the nature of science
scientific explanation that is widely accepted because it has been tested repeatedly and not proven false
null
null
Multiple Choice
a. control, b. dependent variable, c. hypothesis, d. independent variable, e. physical model, f. theory, g. scientific method
f
3,301
NDQ_000022
the nature of science
Scientific models are an organized step-by-step process to answer a question in science.
null
null
Multiple Choice
a. true, b. false
b
3,302
NDQ_000023
the nature of science
series of logical steps that scientists may use to seek answers to questions
null
null
Multiple Choice
a. control, b. dependent variable, c. hypothesis, d. independent variable, e. physical model, f. theory, g. scientific method
g
3,303
NDQ_000024
the nature of science
possible answer to a question that can be tested to see whether it is false
null
null
Multiple Choice
a. control, b. dependent variable, c. hypothesis, d. independent variable, e. physical model, f. theory, g. scientific method
c
3,304
NDQ_000025
the nature of science
The dependent variable in an experiment is directly influenced by the independent variable.
null
null
Multiple Choice
a. true, b. false
a
3,305
NDQ_000026
the nature of science
variable that is measured in an experiment to see how it is affected by another variable
null
null
Multiple Choice
a. control, b. dependent variable, c. hypothesis, d. independent variable, e. physical model, f. theory, g. scientific method
b
3,306
NDQ_000027
the nature of science
Even if there is information we dont know, a model can be used to explain an event.
null
null
Multiple Choice
a. true, b. false
a
3,307
NDQ_000028
the nature of science
A theory will still remain even if conflicting data is discovered.
null
null
Multiple Choice
a. true, b. false
b
3,308
NDQ_000036
the nature of science
Science is a set of knowledge and also a way of knowing things.
null
null
Multiple Choice
a. true, b. false
a
3,309
NDQ_000037
the nature of science
A scientific hypothesis is useful only if it is proven to be true.
null
null
Multiple Choice
a. true, b. false
b
3,310
NDQ_000038
the nature of science
Controls are factors that could affect the outcome of an experiment.
null
null
Multiple Choice
a. true, b. false
a
3,311
NDQ_000039
the nature of science
A scientific investigation always begins with a theory.
null
null
Multiple Choice
a. true, b. false
b
3,312
NDQ_000040
the nature of science
An example of a scientific hypothesis is that angels dance on the head of a pin.
null
null
Multiple Choice
a. true, b. false
b
3,313
NDQ_000041
the nature of science
An example of a scientific theory is the theory of plate tectonics.
null
null
Multiple Choice
a. true, b. false
a
3,314
NDQ_000042
the nature of science
A globe is a physical model of planet Earth.
null
null
Multiple Choice
a. true, b. false
a
3,315
NDQ_000043
the nature of science
Only models that are perfect representations of reality are useful in science.
null
null
Multiple Choice
a. true, b. false
b
3,316
NDQ_000044
the nature of science
You should wear a hoodie to protect your hair when you work in a science lab.
null
null
Multiple Choice
a. true, b. false
b
3,317
NDQ_000045
the nature of science
You should take a first aid kit when you do a science investigation in the field.
null
null
Multiple Choice
a. true, b. false
a
3,318
NDQ_000139
erosion and deposition by wind
Wind causes very little erosion.
null
null
Multiple Choice
a. true, b. false
b
3,319
NDQ_000140
erosion and deposition by wind
Wind can carry dust just a few kilometers.
null
null
Multiple Choice
a. true, b. false
b
3,320
NDQ_000141
erosion and deposition by wind
Particles that the wind moves by traction stay on the ground.
null
null
Multiple Choice
a. true, b. false
a
3,321
NDQ_000142
erosion and deposition by wind
Wind-blown sand cannot erode solid rock.
null
null
Multiple Choice
a. true, b. false
b
3,322
NDQ_000143
erosion and deposition by wind
When wind slows down, it deposits smaller sediments first.
null
null
Multiple Choice
a. true, b. false
b
3,323
NDQ_000144
erosion and deposition by wind
A sand dune migrates in the same direction that the wind usually blows.
null
null
Multiple Choice
a. true, b. false
a
3,324
NDQ_000145
erosion and deposition by wind
A sand dune has a gentle slope on the slip face side.
null
null
Multiple Choice
a. true, b. false
b
3,325
NDQ_000146
erosion and deposition by wind
Wind causes less erosion when it blows at a higher speed.
null
null
Multiple Choice
a. true, b. false
b
3,326
NDQ_000147
erosion and deposition by wind
Wind erosion can be reduced by planting rows of trees around fields.
null
null
Multiple Choice
a. true, b. false
a
3,327
NDQ_000148
erosion and deposition by wind
Fences are used to help prevent erosion of sand dunes.
null
null
Multiple Choice
a. true, b. false
a
3,328
NDQ_000149
erosion and deposition by wind
type of erosion caused by wind-blown sand
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
f
3,329
NDQ_000150
erosion and deposition by wind
type of deposit formed when wind drops very small particles of sediment
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
a
3,330
NDQ_000151
erosion and deposition by wind
how wind carries particles larger than sand
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
g
3,331
NDQ_000152
erosion and deposition by wind
air moving over Earths surface
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
d
3,332
NDQ_000153
erosion and deposition by wind
how wind carries sand
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
e
3,333
NDQ_000154
erosion and deposition by wind
small hill of sand deposited by wind
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
b
3,334
NDQ_000155
erosion and deposition by wind
how wind carries the smallest sediments
null
null
Multiple Choice
a. loess, b. sand dune, c. suspension, d. wind, e. saltation, f. abrasion, g. traction
c
3,335
NDQ_000156
erosion and deposition by wind
Wind drops the sediment it is carrying when it
null
null
Multiple Choice
a. slows down., b. is very moist., c. arrives at a beach., d. reaches a certain altitude.
a
3,336
NDQ_000157
erosion and deposition by wind
What is the first step in the formation of a sand dune?
null
null
Multiple Choice
a. Wind carrying sand strikes an obstacle., b. Wind moves particles of sand up a gentle slope., c. Wind moves particles of sand down a slip face., d. Wind deposits particles of silt and clay.
a
3,337
NDQ_000158
erosion and deposition by wind
A sand dune migrates because wind keeps
null
null
Multiple Choice
a. reversing its direction., b. blowing sand up and over the dune., c. causing longshore drift., d. none of the above
b
3,338
NDQ_000159
erosion and deposition by wind
Deposits called loess
null
null
Multiple Choice
a. form vertical cliffs., b. have thick rich soil., c. are deposited by wind., d. all of the above
d
3,339
NDQ_000160
erosion and deposition by wind
Loess deposits consist of
null
null
Multiple Choice
a. sand and silt., b. silt and clay., c. clay and gravel., d. gravel and sand.
b
3,340
NDQ_000161
erosion and deposition by wind
Loess deposits are used for
null
null
Multiple Choice
a. rock climbing., b. gold mining., c. farming., d. none of the above
c
3,341
NDQ_000162
erosion and deposition by wind
Soil is less likely to be eroded by wind if it is
null
null
Multiple Choice
a. located on flat land., b. covered with plants., c. surrounded by trees., d. two of the above
d
3,342
NDQ_000472
history of earths life forms
geologic era known as the age of reptiles
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
f
3,343
NDQ_000473
history of earths life forms
When large numbers of organisms die out completely at the same time, it is a(n) ____________.
null
null
Multiple Choice
a. mass evolution, b. mass extinction, c. punctuated equilibrium, d. punctuated evolution
b
3,344
NDQ_000474
history of earths life forms
trait that helps an organism survive or reproduce
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
e
3,345
NDQ_000475
history of earths life forms
A species changes over time if
null
null
Multiple Choice
a. its environment changes, b. its members contain genetic variations, c. it survives, d. all of these
d
3,346
NDQ_000476
history of earths life forms
random change in a gene
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
a
3,347
NDQ_000477
history of earths life forms
The Cambrian is best known for
null
null
Multiple Choice
a. a huge mass extinction, b. the swamps that produced massive coal deposits, c. an incredible increase in the number of species, d. the origin of life
c
3,348
NDQ_000478
history of earths life forms
Compared with their ancestors, horses today are
null
null
Multiple Choice
a. very similar, b. smaller than those ice age giants, c. adapted to a different environment, d. none of these
c
3,349
NDQ_000479
history of earths life forms
geologic era in which plants and animals first lived on land
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
c
3,350
NDQ_000480
history of earths life forms
genetic changes in a population or species over time
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
b
3,351
NDQ_000481
history of earths life forms
At the end of the Paleozoic,
null
null
Multiple Choice
a. more than 95% of all species went extinct, b. a giant asteroid certainly struck Earth, c. dinosaurs and other land animals went extinct, d. none of these
a
3,352
NDQ_000483
history of earths life forms
geologic era during which human beings evolved
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
g
3,353
NDQ_000484
history of earths life forms
difference in a genetic trait in a population
null
null
Multiple Choice
a. mutation, b. evolution, c. Paleozoic, d. variation, e. adaptation, f. Mesozoic, g. Cenozoic
d
3,354
NDQ_000492
history of earths life forms
Organisms alive today evolved from earlier life forms.
null
null
Multiple Choice
a. true, b. false
a
3,355
NDQ_000494
history of earths life forms
Adaptations are inheritable characteristics that help an organism to survive.
null
null
Multiple Choice
a. true, b. false
a
3,356
NDQ_000497
history of earths life forms
Mass extinctions often separate the time periods on the geologic time scale.
null
null
Multiple Choice
a. true, b. false
a
3,357
NDQ_000499
history of earths life forms
A mutation is almost always favorable.
null
null
Multiple Choice
a. true, b. false
b
3,358
NDQ_000500
history of earths life forms
Any animal can adapt to any environmental conditions.
null
null
Multiple Choice
a. true, b. false
b
3,359
NDQ_000501
history of earths life forms
More than a million species are known to live on Earth today.
null
null
Multiple Choice
a. true, b. false
a
3,360
NDQ_000502
history of earths life forms
Almost all existing species have now been discovered.
null
null
Multiple Choice
a. true, b. false
b
3,361
NDQ_000503
history of earths life forms
All organisms have a unique set of traits.
null
null
Multiple Choice
a. true, b. false
a
3,362
NDQ_000504
history of earths life forms
All gene mutations are harmful.
null
null
Multiple Choice
a. true, b. false
b
3,363
NDQ_000505
history of earths life forms
Adaptations evolve because they help organisms survive or reproduce.
null
null
Multiple Choice
a. true, b. false
a
3,364
NDQ_000506
history of earths life forms
All organisms alive today evolved from earlier life forms.
null
null
Multiple Choice
a. true, b. false
a
3,365
NDQ_000507
history of earths life forms
Ancient horses were much larger than they are today.
null
null
Multiple Choice
a. true, b. false
b
3,366
NDQ_000508
history of earths life forms
Most species that once lived on Earth are now extinct.
null
null
Multiple Choice
a. true, b. false
a
3,367
NDQ_000509
history of earths life forms
Paleozoic life was more diverse on land than in the oceans.
null
null
Multiple Choice
a. true, b. false
b
3,368
NDQ_000510
history of earths life forms
Moving from water to land required many new adaptations.
null
null
Multiple Choice
a. true, b. false
a
3,369
NDQ_000511
history of earths life forms
The Cambrian Period occurred at the beginning of the
null
null
Multiple Choice
a. Mesozoic Era., b. Paleozoic Era., c. Phanerozoic Eon., d. two of the above
d
3,370
NDQ_000512
history of earths life forms
Our own species evolved during the
null
null
Multiple Choice
a. Cambrian Period., b. Cenozoic Era., c. Proterozoic Eon., d. two of the above
b
3,371
NDQ_000513
history of earths life forms
Which answer best completes the following sentence? Adaptations help an organism survive ...
null
null
Multiple Choice
a. without new mutations., b. in a specific environment., c. during a given geologic eon., d. in any ecosystem on Earth.
b
3,372
NDQ_000514
history of earths life forms
Cacti have traits that help them survive in a
null
null
Multiple Choice
a. tropical rainforest., b. very cold climate., c. desert., d. none of the above
c
3,373
NDQ_000515
history of earths life forms
Variation in a genetic trait is first introduced by
null
null
Multiple Choice
a. mutation., b. evolution., c. adaptation., d. reproduction.
a
3,374
NDQ_000516
history of earths life forms
How did Earths climate change during the Phanerozoic Eon?
null
null
Multiple Choice
a. The climate became steadily colder., b. The climate became steadily warmer., c. The climate cycled between warmer and colder., d. none of the above
c
3,375
NDQ_000517
history of earths life forms
Which statement about the Cambrian Period is false?
null
null
Multiple Choice
a. It began about 540 million years ago., b. It had a warm, humid tropical climate., c. It had an explosion of living things., d. It ended with the Permian mass extinction.
d
3,376
NDQ_000947
air movement
Rising air creates an area of
null
null
Multiple Choice
a. high pressure on the surface., b. low pressure near the ground., c. high wind in the stratosphere., d. low temperature close to the surface.
b
3,377
NDQ_000948
air movement
A low pressure zone forms where
null
null
Multiple Choice
a. warm air rises, b. cold air rises, c. water evaporates, d. cold and warm air rapidly mix
a
3,378
NDQ_000949
air movement
Winds always blow from an area of higher to lower
null
null
Multiple Choice
a. mass., b. density., c. pressure., d. temperature.
c
3,379
NDQ_000950
air movement
Winds blow when
null
null
Multiple Choice
a. warm air rises., b. cool air sinks., c. air flows from high to low pressure., d. air flows from low to high pressure.
c
3,380
NDQ_000951
air movement
Examples of local winds include
null
null
Multiple Choice
a. easterlies., b. westerlies., c. monsoons., d. trade winds.
c
3,381
NDQ_000952
air movement
Rain is most likely to fall as an air mass
null
null
Multiple Choice
a. descends down a mountain range., b. rises up a mountain range., c. rises over the desert., d. none of these
b
3,382
NDQ_000953
air movement
The time for an airplane to fly between San Francisco and New York relative to NY to SF is
null
null
Multiple Choice
a. greater due to the westerly winds., b. less due to the westerly winds., c. greater due to the easterly winds., d. less due to the easterly winds.
b
3,383
NDQ_000954
air movement
Air that rises over the equator sinks back to the surface at
null
null
Multiple Choice
a. 90 N and S., b. 45 N and S., c. 30 N and S., d. 15 N and S.
c
3,384
NDQ_000955
air movement
North of the equator, the trade winds blow from
null
null
Multiple Choice
a. northeast to southwest., b. northwest to southeast., c. southwest to northeast., d. southeast to northwest.
a
3,385
NDQ_000956
air movement
Precipitation is high
null
null
Multiple Choice
a. in low pressure areas where air is sinking., b. in high pressure areas where air is rising., c. in high pressure areas where air is sinking., d. in low pressure areas where air is rising.
d
3,386
NDQ_000958
air movement
Which statement about jet streams is false?
null
null
Multiple Choice
a. They result from unequal heating., b. They circle the planet., c. They are very fast., d. none of the above
d
3,387
NDQ_000959
air movement
The northern polar jet stream helps planes fly from
null
null
Multiple Choice
a. east to west., b. west to east., c. south to north., d. north to south.
b
3,388
NDQ_000961
air movement
wind that blows from the land to the ocean during the night
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
c
3,389
NDQ_000964
air movement
fast-moving air current high in the troposphere
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
b
3,390
NDQ_000966
air movement
any air movement that occurs because of unequal heating of the atmosphere
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
g
3,391
NDQ_000967
air movement
The westerly winds travel toward the west.
null
null
Multiple Choice
a. true, b. false
b
3,392
NDQ_000968
air movement
wind that blows over a limited area
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
d
3,393
NDQ_000969
air movement
Cool air sinking creates a high pressure zone at the ground.
null
null
Multiple Choice
a. true, b. false
a
3,394
NDQ_000970
air movement
wind that blows between the ocean and land in southern Asia
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
e
3,395
NDQ_000971
air movement
wind that blows from the ocean to the land during the day
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
f
3,396
NDQ_000972
air movement
Wind is created by air that moves vertically between high and low pressure zones.
null
null
Multiple Choice
a. true, b. false
b
3,397
NDQ_000973
air movement
wind that occurs in a belt that goes around the planet
null
null
Multiple Choice
a. global wind, b. jet stream, c. land breeze, d. local wind, e. monsoon, f. sea breeze, g. wind
a
3,398
NDQ_000974
air movement
Walking on the beach in San Diego in December, one would likely feel a strong sea breeze coming off
null
null
Multiple Choice
a. true, b. false
b
3,399
NDQ_000975
air movement
Winds blow northeast to southwest or the reverse due to Coriolis Effect.
null
null
Multiple Choice
a. true, b. false
a