Water on Earth Unit Review

Water on Earth is either freshwater or saltwater. What is the percent ratio of freshwater to percent saltwater on Earth?

• 1% freshwater : 99% saltwater

• 3% freshwater : 97% saltwater

• 30% freshwater : 70% saltwater

• 50% freshwater : 50% saltwater

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Which of the following is true about freshwater distribution on Earth?

• there is very little water underground

• the majority is found in rivers and lakes

• the majority is liquid water

• the majority is ice

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Of all the water on Earth, the amount accessible for humans to consume is:

• 95%

• 1%

• 25%

• 75%

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The water that is located within the rocks and soil below the Earth's surface is called (a)   .

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Ocean water differs from freshwater in that it has

• Ocean water has a higher temperature

• Ocean water has a lower temperature

• Ocean water has a higher concentration of salt

• Ocean water has a lower concentration of salt

Plants take in the increased groundwater and use the water for photosynthesis. Plants also release water into the atmosphere as a by-product of cellular respiration. What process returns the water to the water cycle?

• condensation

• precipitation

• condensation

• transpiration

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Describe the role of temperature change in cloud formation

• As water on Earth cools down, it condenses in the air and forms clouds.

• As water on Earth cools down, it evaporates into the atmosphere and forms clouds.

• Water on Earth heats up and evaporates into the atmosphere, then cools and condenses to form clouds.

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What powers the water cycle?

• rain and snow

• ocean currents

• springs and wells

• sun's energy

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Assume we have a very cold winter with lots of snow. The mountain top is piled high with snow. Then it is spring. How will this impact the water cycle model?

• Run-off will DECREASE

• Groundwater will INCREASE

• Precipitation will INCREASE

• Transpiration will DECREASE

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Water that has evaporated returns to the earth as

• condensation

• sublimation

• precipitation

• surface runoff

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