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← GeographyWhich outcome accelerates mechanical weathering on shale slopes?
A)Freeze-thaw crack expansion cycles✓
B)High concentration lichen growth
C)Deposition of clay soil layers
D)Increased stabilization using vegetation
💡 Explanation
Cracks in shale widen because the volume of water expands upon freezing, thus applying pressure to the rock in a process known as freeze-thaw weathering. These freeze-thaw cycles break rock, rather than biotically induced weathering or soil compaction.
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