1. The wedging of tree roots along sidewalks, breaking apart
rocks and cement
2. Limestone reacting with carbonic acid
3. Animals burrowing and digging in rock
4. Repeated freezing and thaw of water that cracks the rock
5. Acid from plants' roots that break up the rock
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Answer:
1.Mechanical
2.Chemical
3.Mechanical
4.Mechanical
5.Chemical