Water on Earth

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What is groundwater?

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Groundwater is water that is found underground in reservoirs called aquifers. It is an important source of drinking water.

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NGSS.MS-ESS2-4

NGSS.MS-ESS3-1

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What is an aquifer?

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An aquifer is an underground layer of water-bearing rock or sediment that can store and transmit groundwater.

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NGSS.MS-ESS3-1

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What percentage of the Earth is covered by water?

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Approximately 70% of the Earth's surface is covered by water.

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NGSS.MS-ESS2-4

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What is a glacier?

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A glacier is a large sheet of ice that moves very slowly across the land, typically found in extremely cold regions.

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Where is most of the Earth's freshwater located?

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Most of the Earth's freshwater is located in the cryosphere, which includes glaciers and ice caps.

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NGSS.MS-ESS2-4

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What is the cryosphere?

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The cryosphere refers to the frozen water part of the Earth system, including glaciers, ice caps, and sea ice.

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NGSS.MS-ESS2-4

NGSS.MS-ESS3-4

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What is salt water?

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Salt water is water that contains a significant concentration of dissolved salts, primarily found in oceans.

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What is the difference between salt water and fresh water?

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Salt water contains a high concentration of salts, while fresh water has a low concentration of salts and is found in rivers, lakes, and aquifers.

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What is the water cycle?

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The water cycle is the continuous movement of water on, above, and below the surface of the Earth, including processes like evaporation, condensation, and precipitation.

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NGSS.MS-ESS2-4

Front

What is evaporation?

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Evaporation is the process by which water changes from a liquid to a gas, usually due to heat from the sun.

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NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

NGSS.MS-PS1-4