An area of water where the fresh water from a river meets the salt water from the sea.

The amount of dissolved salts in a body of water.

A variety of compounds that are essential to the growth and survival of living organisms.

Possessing the ability to reproduce offspring or grow living things.

A poisonous substance that causes harm to living organisms.

Any single identifiable source of pollution from which pollutants are discharged.

Pollution that occurs as a result of multiple factors that can not be specifically identified.

A living organism that gives us an idea of the health of an ecosystem.

The measure of cloudiness in a body of water.

A substance used to kill, repel, or control organisms that are considered to be pests.

The variety of living organisms in a particular area

The emission of light by living creatures through biochemical reactions.

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