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Weathering:  The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose.

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Presentation on theme: "Weathering:  The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose."— Presentation transcript:

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2 Weathering:  The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose rocks

3 Two Types of Weathering:  Mechanical – the process by which rocks break down into smaller pieces by physical means  Chemical – the process by which rocks break down as a result of chemical reactions

4 Ice Wedging:  When water gets into the cracks of rocks, freezes and expands putting stress on or breaks the rock

5 Abrasion:  When rocks rub against each other, usually fragments being carried by agents of erosion, leads to rounding of particles

6 Plant or Animal Activity:  The roots of plants or the displacement of rocks or soil by animals contribute to erosion

7 Changes in Temperature:  The daily expanding and contraction of rocks due to changing temperatures

8 Oxidation:  Process in which elements combine with oxygen, commonly occurs in rock that has iron in it

9 Hydrolysis:  A chemical reaction of a substance with water, thus minerals will dissolve in water

10 Acid Rain:  Precipitation that contains a high concentration of acid due to pollution

11 Rock Composition:  Density and composition changes the rate of erosion

12 Surface Area:  The more surface area exposed, the faster the weathering

13 Fractures and Joints:  Naturally forming cracks make the rock weaker

14 Climate:  Alternating hot and cold climates allow for faster weathering, as well as hot and humid

15 Topography:  Steeper slopes allow for faster erosion due to the force of gravity

16 Sediment:  Fragments or particles of rock produced by weathering, named according to size

17 Deposition:  Process by which transported sediment is dropped in new places by agents of erosion

18 Horizontal Sorting/Deposition  Particles carried by a stream or wind begin to be deposited as velocity decreases, thus larger particles are deposited first and smaller particles are carried further

19 Vertical Sorting/Deposition:  Larger or more dense particles will settle first, smaller or less dense particles take longer


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