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Weathering The breakdown of rocks into smaller particles. 2 Types 1.Physical: Only size and shape changes. 2.Chemical: composition changes.

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Presentation on theme: "Weathering The breakdown of rocks into smaller particles. 2 Types 1.Physical: Only size and shape changes. 2.Chemical: composition changes."— Presentation transcript:

1 Weathering The breakdown of rocks into smaller particles. 2 Types 1.Physical: Only size and shape changes. 2.Chemical: composition changes

2 Surface Area

3 Physical Weathering What causes physical weathering? 1. Ice = freezing and thawing (frost cycle).

4 Physical Weathering 2. Wind = rocks get pitted from blown particles. Ventifact = angular, pitted rock with 1 or more flat sides.

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9 Physical Weathering 3. Water = rocks become round, smooth and smaller. Abrasion = rocks break down from rubbing against each other.

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12 Physical Weathering 4. Plants = roots grow and expand, breaking rock apart.

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15 Physical Weathering 5. Animals = Ants / Worms Humans

16 Chemical Weathering 3 Types 1. Oxidation = reaction with O 2 2. Hydrolysis = reaction with H 2 O 3. Carbonation = reaction with CO 2 ** Occurs faster in hot and wet weather.

17 Oxidation

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19 Hydrolysis

20 Carbonation

21 Salt (Honeycomb)


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