weathering and erosion
TRANSCRIPT
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Weathering and Erosion
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Weathering
The breakdown do the materials of Earth’s crust into smaller pieces.
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Physical Weathering• Process by which rocks are
broken down into smaller pieces by external conditions.
Types of Physical Weathering• Frost heaving and Frost wedging• Friction and impact• Burrowing of animals
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Frost Wedging
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Friction and Repeated Impact
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Chemical Weathering
• The process that breaks down rock through chemical changes.
The agents of chemical weathering
–Water– Oxygen– Carbon dioxide– Living organisms– Acid rain
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Water• Water weathers rock by dissolving it
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Oxygen
• Iron combines with oxygen in the presence of water in a processes called oxidation
• The product of oxidation is rust
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Carbon Dioxide
• CO2 dissolves in rain water and creates carbonic acid
• Carbonic acid easily weathers limestone and marble
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Carbon Dioxide
• CO2 dissolves in rain water and creates carbonic acid
• Carbonic acid easily weathers limestone and marble
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Living Organisms
• Lichens that grow on rocks produce weak acids that chemically weather rock
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Acid Rain• Compounds from burning coal, oil and gas
react chemically with water forming acids.• Acid rain causes very rapid chemical
weathering
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BIOLOGICAL WEATHERING
The breakdown of rock materials through certain biological actions such as penetration of plant roots,burrowing of animals.
TYPES OF BIOLOGICAL WEATHERING
By plant roots Burrowing of animals
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Plant Roots
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Burrowing of Animals