An example which doesn't depict physical weathering is acid rain falling on limestone.
Physical weathering involves the breakdown of rock into smaller particles through physical processes such as friction between rocks as a result of wind blowing sand onto rocks, freeze-thaw in colder climates etc and it is usually reversible.
Chemical weathering on the other hand involves the breakdown of rock into smaller particles through chemical processes or reaction such as acid rain falling on limestone and it is usually irreversible.
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