onion skin weathering weathering is the physical, chemical and biological breakdown of rocks in situ...

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

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Onion skinweathering

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

Day TimeThe sun’s heat

causes the outer layers of the

rock to expand

Most common in fine-grained rocks

(e.g. volcanic rocks) & boulders

The absence of clouds in tropical deserts & the overhead sun produces

high day time temperatures

Page 3: Onion skin weathering Weathering is the physical, chemical and biological breakdown of rocks in situ (same place). Onion skin weathering is also known

Night TimeCooling causes the outer layers of the rock to contract

Repeated daily heating & cooling causes outer layers of rock to be weathered

Layers or shells of rock

peel away

With no clouds rocks cool quickly. A process known as radiation cooling

Layers of rock collect on the desert floor

Different minerals expand and contract at different rates causing stresses along mineral boundaries.

Quarts increases in size by three times more than feldspar

Page 4: Onion skin weathering Weathering is the physical, chemical and biological breakdown of rocks in situ (same place). Onion skin weathering is also known

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?

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