Surface Water CFU

What percentage of Earth's water is freshwater?

• 1.2%

• 2.5%

• 5.0%

• 10.0%

A [ ? ] is an area of land that drains into a particular body of water.

What is a characteristic of headwaters?

• Warm and slow

• Cold and flows quickly

• High biodiversity

As rivers widen, what happens to the biodiversity?

• It decreases

• It remains the same

• It increases

• It disappears

Which term describes the water in an estuary?

• Saline

• Brackish

• Fresh

• Distilled

What is the significance of an estuary?

• It is a desert habitat.

• It is a place for freshwater storage.

• It is a unique ecosystem where freshwater and saltwater mix.

• It is a place for mountain climbing.

What is the largest estuary in the US?

• Delaware Bay

• Chesapeake Bay

• San Francisco Bay

• Galveston Bay

Why do rivers that feed into the bay have poor water clarity and low dissolved oxygen?

• Because lots of nutrients dissolve into the bay

• Because lots of salt dissolves into the bay

• Because the bay does not get enough sunlight

Watersheds begin along a [ ? ], which is the highest point in the watershed.

Only 1.2% of Earth's freshwate is available for living things.

• True

• False