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Weathering - ROCKCYCLE WEATHERING (disintegra5on)and...

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ROCK CYCLE
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WEATHERING the physical breakdown (disintegra5on) and chemical altera5on (decomposi5on) of rocks at or near Earth's surface Slow but constant Plenty of 5me
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SURFICIAL or EXTERNAL PROCESSES Affects the top 150 feet ‐ just!
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WEATHERING scenery
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WEATHERING scenery The Bridestones
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WEATHERING human problems
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Mechanical Weathering rocks are broken down into smaller and smaller pieces ‐ BUT retain the characteris5cs of the original material more Surface area
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Bryce Canyon Hoodoos hKp://faculty.plaKsburgh.edu/carol.treadwellsteitz/Bryce%20Canyon/ Bryce_‐_Marge_Simpson.JPG
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Mechanical Weathering Boulders Cobbles Pebbles All larger than 2mm
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Mechanical Weathering Sand 2mm ‐ 1/16th mm Silt 1/16 th mm ‐ 1/256 Clay Less than 1/256
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Joints faults
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Mechanical Weathering mechanisms
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frost wedging Water freezes to ice ‐ expands 10% Repeated over and over
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frost wedging Talus slope at base
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Salt crystal growth solutions seep into cracks and joints in the rocks and evaporate, leaving salt crystals behind.
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thermal expansion/contrac5on Temperatures are high in the day, Cools greatly at night. Rock heats up and expands by day, Rock cools and contracts by night Stress is exerted on the outer layers.
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