What is it? Weathering is when the shape of a rock is changed Physical weathering is when a rock breaks into smaller pieces. The change in the rock is.

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Presentation transcript:

What is it? Weathering is when the shape of a rock is changed Physical weathering is when a rock breaks into smaller pieces. The change in the rock is physical with no new substances formed. Atom structure stays the same. Ex - Frost action, abrasion, pressure release Chemical weathering is when a rock goes through a chemical reaction with water and atmospheric gases and decomposes. Atoms rearrange and new substances form. Ex - Rusting, acid breakdown, solution weathering

Rust

Acid rain (solution weathering)

Plant Wedging As this tree grows, you can imagine how this will affect the rock. Some species even release a chemical from their roots that helps decompose the rock too.

Oxidation

Lichen

Ice Wedging

Abrasion

Salt Crystallization