SSC
PHYSICAL GEOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The freezing water keeps the rocks in place
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The freezing water makes the rocks last longer
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The freezing water expands inside the cracks and breaks the rocks
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The freezing causes rocks to fall in landslides
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Detailed explanation-1: -When water freezes, it expands. The ice then works as a wedge. It slowly widens the cracks and splits the rock. When ice melts, liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split.
Detailed explanation-2: -Frost wedging is the process by which water seeps into cracks in a rock, expands on freezing, and thus enlarges the cracks (Figure 5.5). The effectiveness of frost wedging is related to the frequency of freezing and thawing. Frost wedging is most effective in a climate like Canada’s.
Detailed explanation-3: -So, the water which collects in the cracks of rocks expands on freezing. This puts pressure on the rock. The ice again melts and then freezes again. This process continues and the crack in rock expands to destroy the rock.
Detailed explanation-4: -Freezing happens when the molecules of a liquid get so cold that they slow down enough to hook onto each other, forming a solid crystal. For pure water, this happens at 32 degrees Fahrenheit, and unlike most other solids, ice expands and is actually less dense than water. That is why ice cubes float!