Question

difference between block and glanular disintegration .

Answer 1

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Denudation thus, denudation = weathering + transportation. The depositional feature is also included in the erosion. Therefore, we see erosion in a broader concept, because it includes both transportation and deposition. (1) Block Disintegration Due to Temperature Change: The repetition* of expansion and contraction of outer rock layers due to diurnal rangeof temperature in the hot desert areas causes tension and stresses which introduce parallel joints in the Rocks. (2)Granular Disintegration Due to Change in Temperature: The coarse grained rocks are more affected by shattering process in those hot deserts which are characterised by high range of daily temperature. (3) Shattering Due to Rain Shower and Heat: The outer shells of the rocks are shattered hot climatic regions mainly in hot desert areas. (4) Block disintegration due to frost: Frost action weakens the rocks in two ways: Due to freeze and thaw of water between the particles of the rocks. Due to freeze and thaw of water in the crevices and spaces. (5)Exfoliation due to temperature and wind: Exfoliation weathering, also known as onion weathering, refers to peeling off concentrjc shells of rocks due to combined actions of heat and wind in hot arid and semi-arid regions and monsoon lands. The outer shells of rocks become loose due to alternate expansion and contraction due to high temperature during daytime and comparatively low temperature during night respectively, and these loosened shells are removed (peeled off by strong winds). (6) Disintegration and exfoliation due to unloading: Sheeting refers to the development of cracks and fractures Parallel to the surface caused bv removal of super-incurnbent load resulting into reduction of conflicting pres-sure.
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