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21 Cards in this Set
- Front
- Back
What is the Earth's Inner Core?
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-Solid
-Very Hot! -Mostly Iron |
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What is Earth's Outer Core?
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-Liquid
-Mostly Iron |
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What is the Earth's Mantle?
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-Solid
-Mostly Iron and Magnesium rocks |
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What is the Earth's Crust?
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-Outer Rock Layer
-Moho Discontinuity (light crust rocks are separated from mantle) |
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What is the Earth's Lithosphere?
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-Cool outer layer of the Earth
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So is the Asthenosphere the Lithosphere?
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Yes, it's underneath it and is a hot slowly flowing layer of rock
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Difference between Ocean Crust and Continental Crust?
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Ocean crust is more dense, thinner, and younger
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What does less dense magma do that more dense magma doesn't?
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Rises
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How do we know about Earth's structure?
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Seismology?
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What part of the Earth does plate tectonics affect?
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The Lithosphere
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What does Divergent mean in terms of Plate boundaries?
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-When moves away and lava comes up the middle
-Usually Oceanic |
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What does an ocean-continent convergent boundary do?
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Ocean plate sinks below and forms volcanic and earthquake activity or mountain ranges and a subduction zone.
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What does an ocean-ocean convergent boundary do?
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Older plate sinks below younger and forms deep trenches, a subduction zone and earthquakes/volcano activity ensues.
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What does a continent-continent boundary do?
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Neither plate sinks and compression occurs. Forms high mountain chain and triggers earthquakes.
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What about Transform boundaries with ocean-ocean and continent to continent?
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Plates slide past each other and earthquakes are common.
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How fast do plates move?
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A few centimeters per year
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Who discovered mid ocean ridges?
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Harry H. Hess
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What is Paleomagnetism and what does Curie Point have to do with it?
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Iron-bearing minerals orient themselves parallel to
the magnetic field at the critical temperature known as Curie Point and Paleomagnetism is the study of these minerals/rocks. |
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Volcanic rocks have reversed direction. True or False?
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True. Reversals occur every few thousand years.
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What is ridge push?
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The gravitational push away from the crest of mid ocean ridges
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What is it called when the cool, dense ocean plate sinks into the hot asthenosphere?
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Slab pull
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