Where is most of Earth's water located?

An area of land where all of the water drains into a lake or river is called:

Most of the freshwater on Earth is located here:

Which of the following is a characteristic of an estuary?

A layer of rock that collects and stores water is called

An example of nonpoint source pollution is:

An obvious example of point source pollution is:

What can high nitrate and phosphate levels lead to in a water system?

Which of the following contains nitrates and phosphates?

What happens when bacteria decompose algae in an algal bloom?

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