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What is chemical weathering?

It changes the position of the rock or often changing when water interacts.

How was rivers formed?

Mechanical Weathering

Rivers were formed by streams coming from creeks. But it takes a while to form a river.

It is changed over time because there is erosion and weathering happening everyday.

It is when water get into the cracks and joints in bedrock. Then when the ice freezes, it gets bigger and the cracks are opened wider until it breaks off.

after

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After

Before

before

How did Earth changed over time?

What is erosion?

Does Earth have a river system?

Erosion is the process by which soil and rock are removed from the Earth"s surface.

Yes, Earth do have a river system. By the way it flows from mountains to oceans.

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