Planet Earth: Water on Earth Quiz 2.2

The circulation of water from Earth’s surface to the atmosphere and back is called

• precipitation.

• surface water.

• the water cycle.

• evaporation.

What percentage of Earth’s water is saltwater?

• 3 percent

• 50 percent

• 72 percent

• 97 percent

Water vapor is a form of water that is

• liquid.

• gas.

• rain.

• solid.

Which of the following is found below Earth’s surface?

• groundwater

• precipitation

• water vapor

• glaciers

Three common water problems are shortages, pollution, and

• circulation.

• recreation.

• evaporation.

• flooding.