Here is the categorization of the rock weathering examples:
Physical Weathering
- a prairie dog burrowing a hole in a rock
- an insect digging a hole in a rock for its home
- wind blowing off bits of a rock over time
Chemical Weathering
- bits of iron in rock rusting when exposed to oxygen and water
- limestone in rock dissolving when acid rain flows across it
- certain metals in rocks oxidizing by exposure to air