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Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question C - 2014

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Question C

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Explain, with the aid of a labelled diagram, how rocks are weathered by frost action.

Worked Solution & Example Answer:Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question C - 2014

Step 1

Labelled Diagram

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Answer

The diagram should illustrate rocks with cracks filled with water due to melting ice. The following labels should be included:

  1. Rock
  2. Ice
  3. Water within cracks
  4. Expansion and contraction labels indicating the freeze-thaw process.

Step 2

Explain the Process of Frost Action: Part 1

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Answer

Frost action, also known as freeze-thaw weathering, occurs when water infiltrates cracks in the rock. As temperatures drop, the water within these cracks freezes and expands, exerting pressure on the surrounding rock. This expansion can create significant stress, leading to the gradual breaking apart of the rock.

Step 3

Explain the Process of Frost Action: Part 2

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Answer

As temperatures rise, the ice melts and the pressure is released. However, the cycle of freezing and thawing can continue repeatedly, further enlarging the cracks. Over time, this repeated process weakens the structure of the rock, culminating in fragmentation and weathering.

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