GK
WORLD GEOGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cracking of rocks caused by the freezing and melting of water
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The transportation of sediment in a stream
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the condensation of water vapor into droplets in clouds
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the formation of a sandbar along the side of a stream
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Detailed explanation-1: -This refers to the repeated freezing and melting of water within small crevices in the rock surface. This expansion and contraction is also a major cause of potholes in streets. Water seeps into cracks in the rocks, and, as the temperature drops below freezing, the water expands as ice in the cracks.
Detailed explanation-2: -Rusting iron because of oxidation is the best example of chemical weathering. Oxidation occurs where there is ready access to the atmosphere and oxygenated waters.
Detailed explanation-3: -Physical weathering (also called mechanical weathering) happens when physical forces repeatedly act on the rock. One example is rocks tumbling over one another, knocking off pieces from one another. This often happens in a river, desert or hillside.