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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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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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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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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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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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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