Water's Distribution on Earth

Oceans contain nearly _____ percent of Earth's water.

• 27
• 30
• 50
• 97

A river is a _____reservoir.

• freshwater
• man-made
• saltwater
• none of these

_____ time is the amount of time the average molecule of water stays in a reservoir.

• Residential
• Residence
• Residue
• Residual

_____ time indicates the amount of time than an average molecule of water stays in a certain storage area.

• Residence
• Reservoir
• Saltwater
• Freshwater

Most of our freshwater is trapped in glaciers and _____.

• oceans
• streams
• groundwater
• ice caps

The amount of time a substance stays in a reservoir is known as its _____ time.

• molecular
• reservoir
• residence
• heavy resort

Ice caps and glaciers contain around _____ percent of the total freshwater on our planet.

• 69
• 15
• .04
• 50

Approximately how much of Earth's freshwater is in a solid state (e.g. glaciers) or underground?

• 99%
• 33%
• 13%
• 66%

What is the world's largest source of surface water?

• The Atlantic ice cap
• The Antarctic ice cap
• The Greenland ice cap
• None of these

How much of the Earth's water is fresh water?

• About 50%
• About 10%
• About 3%
• None of these