Onion skin weathering Weathering is the physical, chemical and biological breakdown of rocks in situ (same place). Onion skin weathering is also known.

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Onion skin weathering Weathering is the physical, chemical and biological breakdown of rocks in situ (same place). Onion skin weathering is also known as: Exfoliation Thermal Expansion Insolation weathering

Most common in fine-grained rocks Day Time The absence of clouds in tropical deserts & the overhead sun produces high day time temperatures The sun’s heat causes the outer layers of the rock to expand Most common in fine-grained rocks (e.g. volcanic rocks) & boulders

Night Time RADIATION COOLING With no clouds rocks cool quickly. A process known as radiation cooling Night Time Repeated daily heating & cooling causes outer layers of rock to be weathered RADIATION COOLING Cooling causes the outer layers of the rock to contract Different minerals expand and contract at different rates causing stresses along mineral boundaries. Quarts increases in size by three times more than feldspar Layers or shells of rock peel away Layers of rock collect on the desert floor

Onion skin weathering Exfoliation is caused by alternate expansion & contraction caused by temperature changes. What happens in the day time? (Dark rock can reach over 50oC) What happens at night time? The outer layers of rock are exposed to extreme temperatures (no vegetation or soil). Outer layers of rock break away from the cooler inner layers. Where can we find extreme temperature changes?