Mechanical and chemical weathering

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What is mechanical weathering?

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Mechanical weathering is the process of breaking down rocks into smaller pieces without changing their chemical composition. Examples include ice wedging and tree roots growing in cracks.

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What is chemical weathering?

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Chemical weathering involves the chemical alteration of minerals in rocks, leading to their breakdown. An example is acid rain dissolving limestone.

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What is ice wedging?

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Ice wedging is a type of mechanical weathering where water seeps into cracks in rocks, freezes, and expands, causing the rock to break apart.

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How do plants contribute to mechanical weathering?

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Plants can contribute to mechanical weathering by growing roots that expand in cracks of rocks, eventually breaking them apart.

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What is acid rain?

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Acid rain is precipitation that has a lower pH due to pollutants in the atmosphere, which can lead to chemical weathering of rocks.

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What is an example of mechanical weathering caused by temperature changes?

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An example is thermal expansion, where rocks expand when heated and contract when cooled, leading to cracks.

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What role do lichens play in weathering?

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Lichens can produce acids that chemically weather rocks, breaking them down over time.

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What is the difference between mechanical and chemical weathering?

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Mechanical weathering physically breaks rocks apart without changing their composition, while chemical weathering alters the minerals in the rocks.

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What is exfoliation?

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Exfoliation is a type of mechanical weathering where layers of rock peel away due to temperature changes and pressure release.

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How does water contribute to weathering?

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Water can cause both mechanical and chemical weathering; it can freeze in cracks (mechanical) or dissolve minerals (chemical).