Topic 6.4: Characteristics of Aquatic Ecosystems

What is a watershed?

• A large body of saltwater.

• The land area that delivers runoff, sediment, and dissolved substances to a body of water.

• An underground storage of water.

• A man-made canal for irrigation.

Which of the following is NOT one of the three distinct stages of a river's journey?

• Source Zone

• Transition Zone

• Floodplain Zone

• Estuary Zone

Which characteristic describes an oligotrophic lake?

• High supply of nutrients.

• Typically shallow.

• Murky brown or green water.

• Crystal-clear water.

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What percentage of the world's largest rivers have been altered by dams and canals?

• 20%

• 40%

• 60%

• 80%