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2.of rock surfaces through the mechanical action of other rock or sand particles Abrasion The collision of rocks that results in the breaking and wearing away of the rocks is a form of mechanical weathering called abrasion. Abrasion is caused by gravity, running water, and wind.
3.Biological activity is sometimes considered a different type of weathering,
biological weathering. However, many still acknowledges it as part of physical
weathering as the process only changes the physical appearance of rocks.
Biological activity includes plants and animals as agents of weathering. For
example, when roots of plants grow, they exert more pressure to rocks which
causes them to slowly break. Animals like rabbits can move rock fragments to
the surface as they dig into soil. Rocks get to be more exposed to more
weathering
The three different types of weathering are physical, chemical and biological. Physical weathering is caused by mechanical forces, without any change to the makeup of the rock. For example, water can freeze inside small holes in rock, causing the rock to split and crack. Chemical weathering is caused by reactions among minerals in the rock and outside chemicals. Perhaps the best-known type of chemical weathering is acid rain, precipitation that contains acids that corrode the surface of rock.
Biological weathering only refers to weathering caused by organisms -- animals, plants, fungi and microorganisms such as bacteria. While certain forms of biological weathering, such as the breaking of rock by tree roots, are sometimes categorized as either physical or chemical, biological weathering can be either physical or chemical. Biological weathering can work hand in hand with physical weathering by weakening rock or exposing it to the forces of physical or chemical weathering.
4.Physical weathering, also known as mechanical weather, is the process of rocks and minerals on Earth's surface breaking down or dissolving as a result of water, ice, salt, plants, animals or changes in temperature. Physical weathering does not change the chemical composition of the rock, just cracks and crumbles it into smaller pieces. After a rock has weathered, erosion occurs, transporting bits and pieces away. Finally a deposition process deposits the rock particles in a new place.
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