The Water Cycle, Water Distribution, Properties of Water

Which step in the water cycle involves returning of fresh water to the Earth?

• precipitation

• evaporation

• respiration

• condensation

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How does most of the water in the water cycle move from lakes and rivers directly back into the atmosphere?

• precipitation

• respiration

• evaporation

• condensation

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What occurs during the process of condensation in the water cycle?

• a change in state from solid to liquid

• a change in state from liquid to gas

• a change in state from gas to liquid

• a change in state from liquid to solid

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Water moves from Earth's surface to the atmosphere and back to Earth's surface again in a process known as the water cycle.Which of the following is the major form of energy driving the water cycle?

• solar energy

• nuclear energy

• geothermal energy

• chemical energy

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Humans, like all other organisms, need fresh water to survive. Of all the water found on Earth, how much of it is fresh water?

• about 3%

• less than 1%

• about 30%

• more than 70%

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In general, surface water always flows

• from south to north

• toward the equator

• from north to south

• downhill

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The diagram shows the distribution of water on the Earth. Which source is the most abundant supply of liquid surface water that is not salty?

• groundwater

• oceans

• lakes

• rivers

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How are evaporation and transpiration similar?

• Both processes occur immediately before precipitation in the water cycle.

• They are both processes in which liquid water is changed into water vapor.

• They both occur in the biosphere.

• They both process water in its solid state.

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Evaporation and transpiration are two processes included in the water cycle. The energy source that drives these processes is

• the burning of fossil fuels.

• the Sun.

• convection within Earth's mantle.

• nuclear fission.

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The Sun heats the Earth's water. This warm water turns into a vapor, and rises into the atmosphere, where it cools off. What happens to this water vapor?

• The water vapor evaporates and escapes into space. New water is formed by precipitation.

• The water vapor only rises for a very short time, then settles back into the ocean unnoticed.

• The water vapor pushes clouds out of the way as it rises. This causes overcast conditions to clear.

• The water vapor condenses as it cools, then it forms clouds. It later returns to the Earth as precipitation.

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