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Weathering Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question 1B - 2018

Question 1B

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

Worked Solution & Example Answer:Weathering Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question 1B - 2018

Step 1

Step 1: Water Collecting in Cracks

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Answer

Water seeps into cracks and crevices in the rocks during warmer conditions. This water is crucial for the frost weathering process.

Step 2

Step 2: Temperature Drop

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Answer

As temperatures drop, particularly at night or during winter, the collected water in the cracks cools down.

Step 3

Step 3: Freezing of Water

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Answer

When the temperature falls below 0°C, the water freezes. This process transforms the water into ice, which occupies a larger volume than liquid water.

Step 4

Step 4: Expansion of Ice

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Answer

The freezing water expands, putting significant pressure on the walls of the cracks. This expansion exerts force on the surrounding rock.

Step 5

Step 5: Repeated Freeze-Thaw Cycles

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Answer

This freeze-thaw cycle may be repeated several times, causing further stress on the rocks. Over time, the repeated expansion and contraction weaken the rock structure.

Step 6

Step 6: Final Fragmentation

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Answer

Eventually, this continuous mechanical stress can lead to the fragmentation of the rock, breaking it into smaller pieces. These pieces can then be further weathered.

Step 7

Labelled Diagram

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Answer

Include a diagram illustrating water collecting in cracks, the freezing process, and the expansion of ice, properly labelled to depict each stage.

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Questions answered

Weathering Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question 1B - 2018

Worked Solution & Example Answer:Weathering Explain, with the aid of a labelled diagram, how rocks are weathered by frost action. - Junior Cycle Geography - Question 1B - 2018

Step 1: Water Collecting in Cracks

Step 2: Temperature Drop

Step 3: Freezing of Water

Step 4: Expansion of Ice

Step 5: Repeated Freeze-Thaw Cycles

Step 6: Final Fragmentation

Labelled Diagram

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