1. Physical Weathering: This involves the breakdown of rocks into smaller pieces without changing their chemical composition.
* Frost Wedging: Water seeps into cracks in rocks, freezes, expands, and puts pressure on the rock, eventually breaking it apart.
* Thermal Expansion and Contraction: Rocks expand when heated and contract when cooled. Repeated cycles of temperature change can cause stress and lead to fracturing.
* Abrasion: Rocks grind against each other (due to wind, water, or glaciers) causing wear and tear.
* Root Wedging: Growing plant roots can exert pressure on cracks in rocks, forcing them to widen and break.
2. Chemical Weathering: This involves the breakdown of rocks through chemical reactions that change their composition.
* Oxidation: Reactions with oxygen can change the mineral composition of rocks, weakening them. (Think of rusting iron).
* Hydrolysis: Water reacts with minerals in rocks, altering their composition and weakening them.
* Dissolution: Some minerals, like limestone, dissolve in water.
* Carbonation: Carbon dioxide in the atmosphere dissolves in rainwater, forming a weak acid that can dissolve some rocks, especially limestone.
Remember, weathering is a continuous process that happens over long periods. The specific types of weathering and their intensity depend on factors like climate, rock type, and the presence of organisms.
