Streams erode sediment from their banks. They pick up and transport sediments. As a stream erodes its banks, it creates a V-shaped valley (Figure above). This contrasts with the U-shaped valleys created by glaciers.
The geologic history of the Earth is broken up into hierarchical chunks of time. From largest to smallest, this hierarchy includes eons<span>, eras, periods, epochs, and ages.
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Water pollution affects marine ecosystems by completely killing it off. Pollution kills fish, reefs, and other underwater life. With this pollution, animal's behaviors can change, and habitats are destroyed.
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