Which of the following processses is are associated with physical weathering 1 ...........

Geography Geomorphology

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Which of the following processses is/are associated with physical weathering ?

1) Frost Wedging

2)Salt weathering

3) Temperature changes and expansion

Select the correct answer using the code given below.

1 only

2 and 3 only

1 and 3 only

1,2 and 3

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Explanation:

Option 1 is correct : Freezing,Thawing and frost wedging results in physical weathering as it results in periodic expansion and contraction of the rocks. Frost weathering occurs due to growth of ice within pores and cracks of rocks during repeated cycles of freezing and melting

Glacial areas are subject to frost wedging daily.Rapid freezing of water causes its sudden expansion and high pressure.The resulting expansion affects joints ,cracks and small inter granular fracturs to become wider and wider till the rock breaks apart.

Option 2 is correct : Salt weathering results in physical weathering . Salts in rocks expands due to thermal action,hydration and crystallisation.

Option 3 is correct : Various minerals in rocks possess their own limits of expansion and contraction. Due to differential heating and resulting expansion and contraction of surface layers results into subsequent exfoliation.