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These minerals tend to form in sheet or plate like structures, with length typically ranging between 10 −7 m and 4x10 −6 m and thickness typically ranging between 10 −9 m and 2x10 −6 m, and they have a relatively large specific surface area. The specific surface area (SSA) is defined as the ratio of the surface area of particles to the ...
Chemical weathering mainly results from the excretion of organic acids and chelating compounds by bacteria [24] and fungi, [25] thought to increase under greenhouse effect. [26] Physical disintegration is the first stage in the transformation of parent material into soil.
Honeycomb weathering – Form of cavernous weathering and subcategory of tafoni Impact crater – Circular depression in a solid astronomical body formed by the impact of a smaller object Joint valley – Landscape originates from the erosion of joints in the bedrock, leaving out small plateaus or ridges in between.
Erosion is distinguished from weathering, since erosion also transports eroded soil away from its place of origin (soil in transit may be described as sediment). Erosion is an intrinsic natural process, but in many places it is greatly increased by human activity, especially unsuitable land use practices. [234]
Physical weathering, also called mechanical weathering or disaggregation, is the class of processes that causes the disintegration of rocks without chemical change. Physical weathering involves the breakdown of rocks into smaller fragments through processes such as expansion and contraction, mainly due to temperature changes.
Weathering and erosion break the original rock down into smaller fragments and carry away dissolved material. This fragmented material accumulates and is buried by additional material. While an individual grain of sand is still a member of the class of rock it was formed from, a rock made up of such grains fused together is sedimentary.
Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term rock formation can also refer to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies. A rock structure can be created in any rock type or combination:
Soil is made up of a multitude of physical, chemical, and biological entities, with many interactions occurring among them. It is a heterogenous mixture of minerals and organic matter with variations in moisture, temperature and nutrients.
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