This separates one watershed from another

An area of land where all water drains toward one body of water

The non-living parts of an ecosystem

The living parts of an ecosystem

Anything that has a negative effect on the environment (water quality)

A working unit of living and non-living things

An area of land covered with a shallow layer of water

A mixture of freshwater and saltwater

This describes how clean the water is

A small river or stream that feeds into a larger river

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