Paper 2 · Weathering and river landforms
Name the type of physical weathering common in hot dry climates, in which the outer layers of rock heat and expand by day, then cool and contract rapidly at night, causing stress that peels off the outer skin of the rock in layers.
Model answer
exfoliation
Also accepted: onion-skin weathering
Explanation: Repeated daily expansion and contraction stresses the outer rock layers until the outer skin peels/flakes off -- exfoliation (onion-skin weathering).
Derived from ZIMSEC Geography 2248/2 Paper 2, June 2014, Q1
