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

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