Ecosystems
Landforms
Weather
Motion and Design
Random
100
Why do large trees have a difficult time living in a tundra?
A A tundra is too hot for trees to grow large.

B Animals that live in a tundra destroy most vegetation.

C Flooding occurs too often in a tundra for large trees to grow.

D The soil in a tundra is too poor for large trees to grow.
100
Which best explains how soil is built up in flood plains?
A Farmers add fertilizer, which makes new soil.

B Plants break down into compost, which makes soil.

C Sediment is deposited by rivers during floods.

D Soil gets used up and the land becomes a desert.
100
Which process changes water from a liquid to a gas?
A precipitation

B evaporation

C cooling

D condensation
100
A dog runs 6 meters in one second. By the end of the next second, the dog has traveled an additional 4 meters. Which best describes the motion of the dog during the two seconds?
A The dog slows down.

B The dog comes to a stop.

C The dog changes in mass.

D The dog changes direction.
100
All of the landforms on Earth areconstantly changing shape. What ismost responsible for the changes in the landforms?
A earthquakes

B water erosion

C pollution

D oceans
200
Which organisms are producers?
A algae

B frogs

C insects

D snakes
200
Where will wind most likely cause erosion?
A swamps

B forests

C grasslands

D deserts
200
Two air masses with large differences in air pressure are near one another. What weather condition will most likely exist between the two air masses?
A low humidity

B high winds

C freezing temperatures

D clear skies

200
In order for a pulley to work properly, it must be able to overcome which force?
A electricity

B gravity

C light

D heat
200
Which is the greatest threat to the survival of large predator species, like mountain lions and tigers
A loss of other predator species

B global climate changes

C loss of large wilderness areas

D animal diseases
300
What is a likely consequence of cutting down rain forests?
A a reduction in the amount of air pollution on Earth

B an increase in the number of plants living on Earth

C a reduction in the variety of organisms living on Earth

D an increase in the number of arctic ecosystems on Earth
300
In which location along a river is erosion most likely to be the greatest?
A at the widest part

B at the flattest part

C at the place with the fastest flow

D at the place with the fewest rocks
300
A student’s school is located in a valley, and her house is on a nearby mountain. She wonders whether the average amount of rainfall at her school is different from the average amount at her house. She investigates by measuring the rainfall in each location. What tool will the student need to collect the information she needs?
A a thermometer

B a barometer

C a hygrometer

D a rain gauge
300
Which best describes how forces must interact for a kite to sail up into the air?
A The force of gravity must be equal to the force of the wind.

B The force of gravity must be greater than the force of the wind.

C The force of the wind must be greater than the force of gravity.

D The force of the person flying the kite must be equal to the force of the wind.
300
Which type of environment is mostly populated with oak, hickory, beech, and maple trees?
A taiga

B deciduous forest

C tundra

D tropical rain forest
400
Which effect does a decrease in sunlight have on a pond ecosystem?
A an increase in oxygen levels

B a decrease in the nitrogen levels

C an increase in the algae population

D a decrease in the algae population
400
What are scale models best used to identify?
A areas of high pollution

B animal habitats

C weather patterns

D landforms
400
Which best describes how air pressure can be affected on hot summer days?
A The air expands and becomes less dense, creating areas of low pressure.

B The air expands and becomes less dense, creating areas of high pressure.

C The air expands and becomes more dense, creating areas of low pressure.

D The air expands and becomes more dense, creating areas of high pressure.
400
What is the most likely reason cars are designed with smooth surfaces?
A to overcome gravity

B to stop easier

C to reduce air resistance

D to keep the engine cool
400
An object moving along a surfacesuddenly increases speed. What can cause this to happen?
A It is moved by balanced forces.

B It is moved by two opposite forces.

C It is moved by an unbalanced force.

D It is moved by a force without direction.
500
A species of giant pandas lives only in central China. Bamboo, a tall, green tropical plant, is the main food source for these animals. Large areas of bamboo are being cut down in central China to make room for growing other crops.
What will most likely happen to these giant pandas?

A They will become endangered or extinct.

B They will migrate to warmer areas of China.

C They will become carnivores.

D They will begin to live in caves.
500
Which factor causes a mud slide?
A the amount of rain in an area

B the amount of carbon dioxide in an area

C the amount of pollution in an area

D the amount of wind in an area
500
Most warm and cold air masses that enter North Carolina are moved by global winds. Which global winds are responsible for most of the local weather in North Carolina?
A northeast trade

B southeast trade

C polar easterlies

D prevailing westerlies
500
A student is riding a bike and applies the brakes. Which most helps the bike to stop?
A friction

B gravity

C heat

D momentum
500
Which best describes a correct order of the water cycle?
A precipitation, runoff, condensation, evaporation, precipitation

B precipitation, runoff, evaporation, condensation, precipitation

C precipitation, evaporation, condensation, runoff, precipitation

D precipitation, evaporation, runoff, condensation, precipitation
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