Weathering and Mass Wasting — Geography STD 11 Commerce / Arts — Question
Maharashtra BoardEnglish MediumSTD 11 Commerce / ArtsGeographyWeathering and Mass Wasting3 Marks
Question
Water plays an important role in weathering.
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Answer
Water plays an important role in weathering because-
In areas where diurnal range of temperature is high, water inside the crack’s freezes. During daytime, it again becomes water.
When water freezes, its volume increases due to the pressure exerted on the walls of the rock, the cracks in the rocks widen and finally rock breaks down due to freeze and thaw weathering.
Water also breaks down the rocks chemically. The water molecules react with minerals present in the rocks. This is called hydrolysis.
Another way by which water can cause chemical weathering is by solution. Minerals like calcium, magnesium dissolves in water.
Oxygen present in air and water reacts with iron or aluminium present in rock and as a result rock rusts and ultimately breaks.
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