Weathering Flashcards

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Describe carbonation weathering.
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When rainwater hits rock it decomposes it or eats it away. This is known as carbonation. This occurs when slightly acidic (carbonic) rain or seawater comes into contact with sedimentary rock, such as limestone or chalk, it causes it to dissolve. A chemical reaction occurs between the acidic water and the calcium carbonate and forms calcium bicarbonate. This is soluble and is carried away in solution. Carbonation weathering occurs in warm, wet conditions.

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Describe carbonation weathering.
What is weathering?
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Weathering is the breakdown of rock in situ by the action of rainwater, extremes of temperature, and biological activity.

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What is weathering?
Describe the processes of freeze-thaw weathering.
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Freeze-thaw weathering occurs when rocks are porous (contain holes) or permeable (allow water to pass through). Water enters the rock and freezes. The ice expands by around 9%. This causes pressure on the rock until it cracks. Repeated freeze-thaw can cause the rock to break up.

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Describe the processes of freeze-thaw weathering.
What is mechanical weathering?
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Mechanical weathering is the breakdown of rock without changing its chemical structure (composition).

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What is mechanical weathering?
What is salt weathering?
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Salt weathering is when salt spray from the sea gets into a crack in a rock. It may evaporate and crystallise, putting pressure on the surrounding rock and weakening the structure.

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What is salt weathering?




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