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| Rocks of every sort and shape are worn away over time. Weathering is the process which breaks rocks into smaller bits. There are three main types: | |
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| Physical weathering is a physical action which breaks up rocks, example freeze-thaw weathering is when water gets into tiny cracks in rocks, the water freezes and expands causing the rock to break | |
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| Chemical weathering is when the rock is chemically attacked: An example of this is the breakdown of limestone by acid rain. | |
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| Biological weathering is when rocks are weakened and broken down by animals and plants. An example would be a tree root system slowly splitting rocks. | |
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