4.1a Mechanical Weathering

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Erosion

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The process of wearing down and carrying away rocks.

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Weathering

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The process that breaks down rock and other substances.

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Mechanical Weathering

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A type of weathering in which the rock is physically broken into smaller pieces.

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Chemical Weathering

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The process that breaks down rock through chemical changes.

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5 types of Mechanical Weathering

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Animal Actions

Freezing & Thawing

Plant Growth

Release of Pressure

Abrasion

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Release of Pressure

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As erosion removes the surface of a rock, the pressure is reduced, causing flaking and cracking.

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Abrasion

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Sand and other rock particles rub against a rock like sandpaper and wear away the rock.

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Frost Wedging

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Wedges of ice widen and deepen cracks in rocks