Water on Earth Review

Potable water means...

• Water which comes straight from a river or reservoir

• Water containing bacteria

• Water which is safe to drink

• Water which contains a high amount of salt

Most of the earth's surface is covered with

• land.

• polar ice.

• salt water.

• fresh water.

An example of salt water is

• a lake

• a river

• an ocean

• tap water

Groundwater is an important source of drinking water especially in Florida. The water is found in an underground reservoir called a /an

• aquifer.

• hydrofer.

• tide pool.

• riparian zone.

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Most of the Earth’s water is found in

• glaciers.

• lakes.

• oceans.

• rivers.

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What percent of the earth is covered by water?

• 20%

• 50%

• 70%

• 85%

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Where is most of the Earth’s freshwater located?

• in lakes

• in rivers

• in oceans

• in glaciers

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About 3% of the water on Earth is freshwater. Only about 40% of that freshwater is available for human use. Why is so much freshwater unavailable for human use?

• It is frozen.

• It is polluted.

• It is salt water.

• It is in aquifers.

Three percent of the water on Earth is freshwater. Less than 0.5% of all the freshwater on Earth is found

• underground.

• in aquifers.

• in rivers and lakes.

• frozen, in ice caps and glaciers.

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Water covers over 70% of planet Earth and most of the water is salt water. Which number on the map of the United States represents a body of salt water?

• 1

• 2

• 3

• 4