Question by : each form of weathering?
can you please list each form or at least 4 forms of weathering.
Answer by Bracha
Each of these has many subcategories:
Weathering in general refers to a group of processes by which surface rock disintegrates into smaller particles or dissolve into water due to the impact of the atmosphere and hydrosphere. The weathering processes often are slow (hundred to thousands of years). The amount of time that rocks and minerals have been exposed at the earth’s surface will influence the degree to which they have weathered.
The difference between physical and chemical weathering is that with the latter one the mineral composition of the mineral or rock is changed. The larger the surface area, i.e, the smaller the fragments, the better for chemical weathering. Water is the dominant agent because it initiates chemical weathering. In the following there is a brief description of the most important chemical weathering processes:
Lichens play an important part in weathering, because they are rich in chelating agents, which trap the elements of the decomposing rock in organo-metallic complexes. Some of the lichens being epilithic (i.e. living on the rock surface), some endolithic (actively boring into the rock surface), and some chasmolithic (living in hollows or fissures within the rock). Evidence for the operation of these processes comes mainly from detailed microscopic and microchemical analyses of the lichen : rock interface. The mechanisms and results of their actions is summarized in Table 5.3.1.
The resistance to weathering, i.e. the mineral stability of parent material depends on.
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