Rivers all run into a larger body of water.
They all have the potential for pollution.
Rivers all change the land even if they are not fast moving.
Rivers provide life for organisms, even stagnant polluted rivers.
Rivers have a beginning and an end.
Rivers can flood.
Rivers are part of the water cycle.
River systems in the world are very different. Some are already polluted while others are at risk of pollution. Some are abundant in life while others only support the basic organisms.
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