Weathering
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Weathering is what breaks down things, like you can put a rock on running water than wait.When you get back to the rock you will see the difference because it has broken down.Canyons are like this because of the weathering.
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erosion
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erosion means to be moved or eroded by natural agents like wind, water, etc.
here is an example of erosion
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deposition
deposition is when soil, water, ice, etc. moves to another landform.
This can destroy landforms or build them up.