Chemical and mechanical weathering

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8 Terms

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Mechanical Weathering

Breaks rocks into smaller pieces by applying pressure

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Freeze-thaw action

exmaple of mechanical weathering

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Water seeps into rock cracks during the day

At night, water freezes and expands by 9%, widening cracks

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Repeated cycles weaken the rock, causing pieces (scree) to break off

Example: Croagh Patrick, Co. Mayo

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Chemical Weathering

Rocks dissolve due to chemical reactions

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Carbonation

Rainwater mixes with carbon dioxide to form weak carbonic acid

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This acid reacts with calcium carbonate in limestone, dissolving it

Limestone’s permeability allows rainwater to flow through

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Example

The Burren, Co. Clar