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Changes in temperature cause rock to expand and contract. This may cause them to crack, and pieces may break off.
The roots of the tree break into the rock.
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Plants roots grow in cracks in rocks. This causes a rock to break apart. Animals dig in the ground and while digging, it breaks down rock gradually.
Weathering and erosion cause the igneous rock to break apart causing sediments from it to go somewhere like a river. Than over time compaction and cementation cause it to become a sedimentary rock.
Weathering and erosion cause the igneous rock to break apart causing sediments from it to go somewhere like a river. Than over time compaction and cementation cause it to become a sedimentary rock.
Ice wedging breaks the rock apart. Water goes into cracks in the rock and when it freezes, it expands. This can cause rocks to split and eventually break. (see the related link)
They expand within cracks in rock to break the rock apart
They expand within cracks in rock to break the rock apart
Tree roots can cause mechanical weathering. Roots will start to grow into cracks in rocks and eventually this will cause the rock to break apart. This is known as mechanical weathering.
Mica and shale