Week 3-4 - • Hot spots: as extinct volcanoes age, they...

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Unformatted text preview: • Hot spots: as extinct volcanoes age, they sink below sea level to become seamounts (guyots) o Coral grows up on volcanoes toward the sun. when the hot spot is there and the volcano grows, the lithosphere heats up and density increases and pops up, and it moves downward. o When the volcano is above sea level and no longer erupts, it erodes and you end up with underwater islands with flat tops o Flat top volcanoes are guyots because waves cut off the tips • Where do hotspot lava comes from? o Below the asthenosphere—we know from remote sensing images and geochemistry • When water goes in contact with magma, water dissolves ions interacting with magma and billions of bacteria —CHEMICAL ENERGY o The bacteria conduct chemosynthesis-takes sulfide dioxide and oxidize it. When you remove electrons it releases energy o Hot springs in the bottom of the ocean o Black smokers o Gives life to tons of odd animals o Tube worms, albino crabs • Read all text in “Interlude B” (pg. 138-150, the ENTIRE interlude) How do rocks get broke down to other rocks—weathering and soil • Near earth surfaces • Mechanical Weathering-breaking big rocks into smaller rocks, no chemical reactions, simply breaking it up Sheeting exfoliation: the separation of rocks into layers parallel to the land surface ( Happens in massive (no sheeting,...
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This note was uploaded on 01/06/2012 for the course GEOL 102 taught by Professor Antoniogarcia during the Fall '11 term at Cal Poly.

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Week 3-4 - • Hot spots: as extinct volcanoes age, they...

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