The Rock Cycle
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Transcript of The Rock Cycle
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The Rock Cycle
The processes through which rocks are formed
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Igneous Rocks
Form by the cooling of molten rock (either lava or magma)
Typically have a texture of random crystals
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Iceland - 1980s, Alan Rubin
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Eruption of Mount St. Helens - May, 1980 (commercial slide)
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Mount St. Helens - 2004
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Middle and North Sister - Oregon Cascades
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Sedimentary Rocks Often form when particles weathered from
earlier rocks are transported (by streams, wind or glaciers) and deposited as sediment
The sediment is then buried and converted to rock by compression and cementation
Typically have a texture of small rounded particles cemented together
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French Pete Creek - Oregon Cascades
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Basin and Range - eastern Nevada
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Cochetopa Creek near Gunnison, Colorado
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Creek building delta into Lyman Lake - Washington Cascades
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Cape Cod, Massachusetts
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Canyonlands National Park, UT - Needles section
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Metamorphic Rocks
Generally form when earlier rocks are subjected to high temperatures and/or pressures (BUT without melting!)
Typically have a crystalline texture, with a pattern to the arrangement of crystals
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Mt. Jefferson,Oregon Cascades
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