SIO notes midterm earth

SIO notes midterm earth - Chapter2 04/02/201016:59:00...

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Chapter 2 04/02/2010 16:59:00 Atmosphere Cosists of 78% nitrogen, 21% oxygen, and 1% other gases.  50% of gas resides below 5.5 km Earth’s surface 70% ocean 30% land
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Chapter 3 04/02/2010 16:59:00 Paleomagnetism When rocks preserve a record of earth’s magnetic field. Magnetic poles Continents move relative to each other while the Earth’s magnetic poles stay  roughly fixed Oceanic crust Contains no granite and not metamorphic rock Only contains basalt and gabbro Sea floor spreading When molten rock rises beneath mid ocean ridges and creates new oceanic  crust Marine mapping Revealed the existence of mid-ocean ridges, deep-ocean trenches, seamount  chains, and fracture zones.
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Chapter 4 04/02/2010 16:59:00 Asthenosphere can go through convection while the lithosphere cannot Lithosphere Consists of crust plus the upper-most (coolest) part of the upper mantle. It  behaves rigidly and somewhat elastically, meaning that when it a force  pushes or pulls on it it does not over flow. No convection Asthenosphere Composed of warmer mantle that can flow when acted on by force  can go through convection Plate boundaries Breaks in the lithosphere Plates The earth’s lithosphere is divided into 15 to 20 plates Plate movement occurs about 1 to 15 cm per year Because of plate tectonics the map of the earth constantly changes Black smokers Hot, mineralized water that rose through cracks in the sea floor after being  heated by magma below the surface. Plate Boundaries Divergant Plate Boundaries o mid atlantic ridge o Mid atlantic ridge in Iceland\ Convergent plate boundaries
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o The mariana trench o Cascade volcanic arc Transform plate boundaries 
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SIO notes midterm earth - Chapter2 04/02/201016:59:00...

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