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15 Cards in this Set
- Front
- Back
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How can the density of Earth be calculated?
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-by lab experiments in high pressure apparatus
-by calculations of avg. density of Earth |
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How does the density of Earth provide evidence that the interior of Earth is denser than the surface?
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-weight of rocks on surface put on rock below, making it more dense
-avg. density of earth is greater than the surface rocks |
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What are the 3 main layers of the Earth?
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Crust, Mantle, Core
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Why is the inner core of Earth solid even though it is hot?
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Because it's under such great pressure.
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How can ocean basins change in size?
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-When litho. continues to stretch
-Can get smaller through subduction- convergent boundary |
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What are the different forms of Convergent plate boundaries?
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--Ocean- Continent
--Ocean- Ocean --Continental- Continental |
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Why is it that transform faults can be used to figure out the directions of plate mvt.? Why can't subduction zones be used for that also?
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Because transform faults have direction: N&S
In subduction, one goes under the other and no direction can be seen |
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What happens when 2 continents collide along a convergent plate boundary?
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They weld and become 1 continent
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Why is plate tectonic a suitable name for study of plate motion?
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Because tectonics comes from Greek word tekton= builder.
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What geographic features would you expect to see at plate boundaries?
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Mountain ranges, rift valleys, and trenches near plate boundaries
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What is the process of continental accretion?
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process of continent's increasing in size by transfer of sediment from one edge of a plate to another.
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What earth system is the plate tectonics?
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Geosphere
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What can we learn about plate mvt. from GPS?
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location, speed, elevation, and direction
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What is another way to study plate mvt.?
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Sea floor spreading
"zebra patterns" in mid ocean ridge |
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What is the difference between lithosphere and asthenosphere?
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Litho.-makes up crust and upper mantle
Asthen.- fluid part of mantle that the giant plates of earth slide on |
