Question

This type of weathering is most common in poles : t a) Frost action b) Hydration c) Solution​

Answer 1

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.[1]

The important agents of mechanical weathering are:

The decrease in pressure that results from removal of overlying rock

Freezing and thawing of water in cracks in the rock

Formation of salt crystals within the rock

Cracking 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, as shown in the granitic rock in Figure 5.3.

Answer 2

Answer:

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