Unit 4 - Water on the Earth

Water on Earth is found naturally as a solid, a liquid, and a gas. Where is MOST of the solid water on Earth?

• Deep in Earth's mantle

• In Earth's polar regions

• In the outer atmosphere

• At the bottom of the ocean

Only 3% of the water on Earth is freshwater. About 60% of that water is not available for man's use. Why is this?

• It is frozen

• It is polluted

• It is too salty

• It is in aquifers

Approximately 99.7% of all water on Earth is found in oceans, seas, ice, and the atmosphere. Based on this information, which statement is most accurate?

• The Earth's freshwater supply is infinite.

• Less than 0.3% of Earth's water is drinkable.

• Humans are not dependent on ocean water.

• The water cycle returns all usable water to the sea.

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Use the chart to answer question 4.

About 97% is found as evaporated water and 3% is frozen water.

• About 97% is found as fresh water and about 3% is salt water.

• About 97% is found as frozen water and 3% is liquid water.

• About 97% is found as salt water and about 3% is fresh water.

• About 97% is found as evaporated water and 3% is frozen water.

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Approximately what percent of the Earth’s water is salt water?

• 97%

• 71%

• 1%

• 3%

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Where is most of the world’s water found? Use the justifications to make your choice.

• Rivers and lakes: The exact depth of the rivers and lakes changes so it is difficult to determine volume.

• Aquifers: underground water, ground deposits: All of the sources of underground water have not been found.

• Oceans: The oceans contain more water by volume than any other source

• Polar ice: The amount of ice below the surface is difficult to determine.

Which statement about Earth’s water is TRUE?

• The total amount of water on Earth constantly changes.

• The total amount of water on Earth stays the same.

• People can live without water.

• Plants and animals can live without water.

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What is the sun’s role in the water cycle?

• To provide light for the cycle.

• To provide the energy to drive the cycle.

• To produce precipitation during the cycle.

• To cause water to condense in the cycle.

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In the water cycle, the loss of water vapor from the leaves of stems and plants is called.

• Precipitation

• Condensation

• Transpiration

• Evaporation

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A student makes a model of the water cycle by using a cup, some water, and plastic wrap. After the student places the model near a sunny window, moisture forms on the inside of the plastic wrap.

What part of the water cycle is being represented on the plastic wrap?

• Evaporation

• Condensation

• Accumulation

• Precipitation

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NGSS.MS-ESS2-4

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