Water on Earth 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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Most of Earth's freshwater is found ...

• in rivers

• frozen in the form of snow, glaciers, and ice caps

• in groundwater stored in cracks and spaces of soil and underground rock

• in lakes

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When it rains, water flows over Earth's surface as ___________. This gathers in lakes, oceans, and streams.

• transpiration

• runoff

• evaporation

• condensation

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The Water brought to the surface from deep holes is:

• Freshwater

• Precipitation

• Groundwater

• Evaporation

Answer explanation

The water brought to the surface from deep holes is groundwater, as it comes from underground sources rather than precipitation or evaporation.

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NGSS.MS-ESS2-4

Approximately what percentage of Earth's water is SALT water?

• 97 %

• 71%

• 30%

• 3%

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About (a)   of Earth's water is salt water found in oceans.

About ​ (b)   of Earth's water is fresh water.

• 97%

• 3%

• 99%

• 1%

• 78%

• 21%

• 50%

• 10%

• 90%

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NGSS.MS-ESS2-4

Water that falls from clouds as rain, snow, sleet, or hail is:

• Water cycle

• Precipitation

• Groundwater

• Evaporation

Answer explanation

Water that falls from clouds as rain, snow, sleet, or hail is referred to as precipitation.

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Why do we need to conserve water?

• It is an unlimited resource. 

• It is a limited resource. 

• There is a lot of water. 

• There is no need to conserve water.

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Proper and careful utilisation of water, avoiding it's wastage, and maintaining the amount of water in its different sources, is called-

• Rain water harvesting

• Water conservation

• Both

• None

How does acid rain, caused by air and water pollution, typically affect the pH level of natural water sources like lakes and rivers?

• Increases the pH, making the water more alkaline

• Decreases the pH, making the water more acidic

• Has no effect on the pH of water sources

• Increases the pH to neutralize the water

• Stabilizes the pH at 7.5

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