Surface Water

The land area that supplies water to a river system

• divide
• watershed
• tributary
• lake

When nutrients build up in a lake.

• eutrophication
• reservoir
• watershed
• divide

The circulation of the earth's water, in which water evaporates from the sea into the atmosphere, where it condenses and falls as rain or snow, returning to the sea by rivers or returning to the atmosphere by evapo-transpiration is called the...

• carbon cycle
• nitrogen cycle
• water cycle
• rock cycle

What percentage of the world's water is found in the Oceans?

• 25%

• 50%

• 75%

• 97%

• 99%

The land around these rivers is known as the _____________.

• tributary

• divide

• water system

• watershed

Where is most of Earth's freshwater located?

• underground

• polar ice caps

• rivers and lakes

• oceans

Where do humans get most of the water they use?

• rivers and lakes

• polar ice caps

• water vapor

• groundwater

Approximately _____ percent of Earth's water is freshwater.

• 97

• 1

• 3

• 10

Of the 3% of freshwater available, what percent can we use for drinking?

• 1%

• 22%

• 23%

• 76%

Which of the following is a disadvantage of dams?

• recreation

• electricity generation

• flood control

• flooding