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18 Cards in this Set
- Front
- Back
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Geology |
geo = earth logos = discourse |
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Physical geology Historical geology |
1) materials composing the earth and seeks to understand the many processes that operate beneath and upon its surface
2) understand the origin of the earth and its development throughout time
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Big Bang: - occurred - old is universe? -abundant elements? |
- 13.7 billion years ago (redshift = doppler effect = light waves) - A lot of hydrogen, little bit helium |
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Big bang cont: - Signif of birth and death of stars - stars form how? star/protostar? thermonuclear reactions why? |
- gives us elements, formed planets, us. -gravitational collapse of denser regions of nebula - |
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nebular material in 2 gen stars - which event is responsible? What happens to older stars that affects new stars? sun a 1st generation star? |
d |
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Essence of accretion theory? differentiated planet? planetismal? |
d |
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Homogeneous accretion/how do account for layering? |
d |
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lines of reasoning used to deduce structure of earth's composition? Seismic waves (particle movement, velocity what determines) Waves travel thru homo vs inhomo
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d |
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Shadow zones? doeseismology alone tell us about composition? What's the MOHO? LVZ? Density and chemical of earths crust different how from mantle? |
d |
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earths magnetic field from a permanantly magnetized zone? Curie temperature? Self-exciting dynamo? "" consistent with comp of planet determ byseis?
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d |
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Magnetic dipole? Idea behind plate tectonics? How did it develop?
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d |
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Evidence for cont drift? Proposed driving mechanism for plate tec? three types plate boundaries? |
d |
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Lithosphere and athenosphere? Lithosphere and crust? Linear magnetic anomolies?
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d |
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earthquake and volcano equally distributed? plate geom and size stay the same? can plate boundaries change?
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d |
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Must a plate consist of only one type of lithosphere? what are geologic processesoccuring at margin? earthquake volcano only at plate bound? |
d |
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How does this all relate to evo of cont and ocean basins? what are hot spots? why volc and seis occur away from plate boundaries? |
d |
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Do simple problems determine rates of plate motion? |
d |
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d |
d |
