* Physical Weathering: This involves the breakdown of rocks and minerals into smaller pieces without changing their chemical composition. Think of it like breaking a cookie into crumbs. Examples include:

* Frost Wedging: Water seeps into cracks, freezes, expands, and then thaws, gradually widening the cracks.

* Abrasion: Rocks and sediment carried by wind, water, or ice grind against other rocks, wearing them down.

* Chemical Weathering: This involves the breakdown of rocks through chemical reactions that change their composition. Think of it like a chemical reaction turning a piece of metal into rust. Examples include:

* Acid Rain: Acidic precipitation dissolves certain types of rocks, especially limestone.

* Oxidation: A reaction with oxygen, like the rusting of iron, can break down rocks.