What causes Weathering?

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Presentation transcript:

What causes Weathering? Weathering is caused by: Water Waves Wind Gravity Glaciers 2 G’s and 3 W’s

What are the types of Weathering? Mechanical weathering also called physical weathering Broken down into of the same material No change in composition smaller pieces Chemical Weathering Breakdown or decomposition of rock that occurs when minerals are changed into different substances Change in composition

What are the types of Mechanical/Physical Weathering? Frost (Ice) Wedging Process where water freezes in the cracks or rocks and wedges (pushed) it apart because water expands with it freezes

What are the types of Mechanical/Physical Weathering? Abrasion The wearing away of rock material by a grinding action Usually caused by sediment in wind, water, and glaciers

What are the types of Mechanical/Physical Weathering? 3. Plants & Animals Plant roots can split rock Animals dig holes break up rocks

What are the types of Mechanical/Physical Weathering? 4. Exfoliation – gradual peeling of layers due to uplift and frost action Ex. Granite domes Yosemite N.P.