WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO...

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WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Transcript of WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO...

Page 1: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)
Page 2: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface

TWO TYPES:1. Mechanical (physically)2. Chemical (chemically)

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Ice Wedging

Page 4: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

MECHANICAL WEATHERING: Ice Wedging: ice freezes and expands w/in cracks and breaks apart rock

Abrasion: scraping

Exfoliation: peeling of surface layers

Root Wedging: roots push apart cracks in rocks

Page 5: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Abrasion

Page 6: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Exfoliation

Page 7: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)
Page 8: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Weathering by Living Things (Biomechanical/Physical)

Page 9: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Hydrolysis: chemical reaction of rock with water

Oxidation: exposure of rock to oxygen causes chemical reactions

Root Leaching: plants use minerals in rock as nutrients which cracks rocks

Carbonic Acid: acid rain (water + CO2)

CHEMICAL WEATHERING

Page 10: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Karst Topography- Caves!

Page 11: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)
Page 12: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Oxidation Oxidation of Desert Landscape

Page 13: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Root Leaching

Page 14: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Acid Rain- corrodes marble & limestone!

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Karst Topography• Chemical weathering of limestone

& dolomite bedrock due to acid rain (hydrolysis)

• Lots of salt and gypsum minerals- highly soluble in water

• Forms caves and different landforms

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Karst Landforms

Page 17: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Rates of Weathering Depend on…

1. Surface area exposure- the more surface area exposed, the faster the rate of weathering

2. Composition of rock- some minerals are weathered easier than others

3. Climates1. Warm, wet climates are conducive to BOTH

chemical and mechanical2. Cold, dry climates mechanical weathering

plays a greater role than chemical- ice, wind, snow/glacier movement

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EROSION:transportation and movement of weathered sediments AGENTS:1. wind 4. gravity2. water 5. volcanoes3. glaciers

Page 19: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Wind

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Water

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Ice

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Gravity

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Volcanic Eruption

Page 24: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

MASS WASTING

Page 25: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Talus – rock fragments that have been weathered from a cliff and pulled down by gravity

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Types of Mass Wasting

1. landslide2. mudslides & mudflows3. creep4. slump

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Page 28: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Creep

Page 29: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Slump

Page 30: WEATHERING: breakup of rock due to exposure to processes that occur at or near Earth’s surface TWO TYPES: Mechanical (physically) Chemical (chemically)

Mudflow

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Earth flow• Landslide NatGeo• Man Catches Land

slide on Tape• Landslide in CA

http://www.youtube.com/watch?v=mknStAMia0Q
http://www.youtube.com/watch?v=mknStAMia0Q
http://www.youtube.com/watch?v=XC9AqJlaCj4&feature=related
http://www.youtube.com/watch?v=XC9AqJlaCj4&feature=related
http://www.youtube.com/watch?v=qEbYpts0Onw&feature=related

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Objectives: Define weathering, mechanical weathering, chemical weathering, erosion, and deposition Define weathering, mechanical weathering, chemical weathering,

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