Basically, weathering refers to gradual process of breaking down of the rocks after long exposure to atmosphere, rain, sun etc.
1. The physical weathering entails a process that causes break-down of rocks and mineral without chemical change.
- The physical weathering changes only the surface characteristics of a substance.
2. The chemical weathering entails a process that causes break-down of rocks and mineral through mineral solutions which change the composition of the substance.
- The chemical weathering changes the internal composition of a substance.
- Also, an acid rain is a factor in this chemical weathering
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