Here are some examples of physical weathering:
* Frost wedging: Water seeps into cracks in rocks, freezes, expands, and puts pressure on the rock, eventually breaking it apart.
* Abrasion: Rocks rub against each other, grinding them down. This can happen due to wind, water, or glaciers.
* Exfoliation: Layers of rock peel away due to pressure release, often when overlying rock is eroded.
It's important to distinguish physical weathering from chemical weathering, where the rock's chemical composition actually changes. Examples of chemical weathering include:
* Acid rain: Rainwater reacts with rocks, dissolving them.
* Oxidation: Iron in rocks reacts with oxygen, forming rust and weakening the rock.
* Hydrolysis: Water molecules break down the minerals in rocks.
