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WEATHERING AND EROSION

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Page 1: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

WEATHERING AND EROSION

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

Weathering:

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

Page 3: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

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

Page 4: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Ice Wedging:

When water gets into the cracks of rocks, freezes and expands putting stress on or breaks the rock

Page 5: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Abrasion:

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

Page 6: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Plant or Animal Activity:

The roots of plants or the displacement of rocks or soil by animals contribute to erosion

Page 7: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Changes in Temperature:

The daily expanding and contraction of rocks due to changing temperatures

Page 8: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Oxidation:

Process in which elements combine with oxygen, commonly occurs in rock that has iron in it

Page 9: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Hydrolysis:

A chemical reaction of a substance with water, thus minerals will dissolve in water

Page 10: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Acid Rain:

Precipitation that contains a high concentration of acid due to pollution

Page 11: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Rock Composition:

Density and composition changes the rate of erosion

Page 12: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Surface Area:

The more surface area exposed, the faster the weathering

Page 13: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Fractures and Joints:

Naturally forming cracks make the rock weaker

Page 14: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Climate:

Alternating hot and cold climates allow for faster weathering, as well as hot and humid

Page 15: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Topography:

Steeper slopes allow for faster erosion due to the force of gravity

Page 16: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Sediment:

Fragments or particles of rock produced by weathering, named according to size

Page 17: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Deposition:

Process by which transported sediment is dropped in new places by agents of erosion

Page 18: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

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

Page 19: Weathering: The natural process by which atmosphere and environmental forces, such as wind, rain, and temperature changes, disintegrate and decompose

Vertical Sorting/Deposition: Larger or more dense particles will

settle first, smaller or less dense particles take longer


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