Oxygen+7

= Oxygen is a gas that allows all organisms to breathe, it's also in rivers and streams. The oxygen gets into the stream by atmospheric pressure, but it also depends on photosynthesis and respiration. =

This picture shows water with a lot of oxygen because the water is moving.

With out oxygen animals would not be able to live. They wouldn't be able to breathe. Even fish would die, if there isn't enough oxygen in the water the fish will eventually die.

The amount of oxygen that enters a river depends on water temperature. As the temperature grows the oxygen in the water decreases.