Question

how forst effect mechanical weathering​

Answer 1

Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice. ... The process may act on a wide range of spatial and temporal scales, from minutes to years and from dislodging mineral grains to fracturing boulders.

Answer 2

Explanation:

• Intrusive igneous rocks form at depths of several hundreds of metres to several tens of kilometres.

• Sediments are turned into sedimentary rocks only when they are buried by other sediments to depths in excess of several hundreds of metres.

• Most metamorphic rocks are formed at depths of kilometres to tens of kilometres.

• Weathering cannot even begin until these rocks are uplifted through various processes of mountain building — most of which are related to plate tectonics — and the overlying material has been eroded away and the rock is exposed as an outcrop.

• The important agents of mechanical weathering are:

• The decrease in pressure that results from removal of overlying rockFreezing and thawing of water in cracks in the rockFormation of salt crystals within the rockCracking from plant roots and exposure by burrowing animals

• When a mass of rock is exposed by weathering and removal of the overlying rock, there is a decrease in the confining pressure on the rock, and the rock expands. This unloading promotes cracking of the rock, known as exfoliation,

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