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Chemical Weathering
Climate is the most important element in chemical weathering processes because it regulates moisture and temperature. In tropical conditions, where moisture and temperature are at maximum levels, chemical weathering occurs at a rate three times higher than in milder climates. An example of chemical weathering is the erosion of rocks by water.
Physical Weathering
This is caused by mechanical processes, such as abrasion and pressure release. Abrasion occurs when a force pushes two rocks together and the surfaces grind against each other, eventually wearing them down. Igneous rocks, formed beneath the surface under pressure, fracture and change form when erosion exposes them to the earth's surface and reduces that pressure.
Biological Weathering
In this case, the actions of organisms changes land formation. These organisms include bacteria, plants and animals. This process has the most effect on soil. For example, animals break down soil particles by burrowing under the earth, exposing soil to other forms of weathering, particularly chemical weathering. Soil organisms, animals and plants all affect moisture levels and the alkalinity of soil and as a result alter land use and form.