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20 Cards in this Set
- Front
- Back
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What is Alfred Wegener known for?
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Continental drift
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What is harry hess known for?
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theory of sea-floor spreading
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what is J.Tuzo wilson known for?
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theory of plate tectonics
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What evdience led to the formation of wegner's thoery?
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1. memsosaurus
2. fossils/coal 3. climate 4. landforms |
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why was the theory rejects ( theory of continental drift)
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thought earth was cooling and shrinking/ couldn't explain how continents moved
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What missing evidence is found to help prove the theory?
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1. evidence from molten material
2. evidence from magnetic stripes 3. evidence from drilling samples |
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In 1965, who writes the theory of plate tectonics?
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j. Tuzo Wilson
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Describe the lithosphere
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Rigid, floats slowly on top on atheno.
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Describe the athenosphere
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soft layer, flows slowly, can be bent like plastic
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Describe the mantle
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layer of hot rock, solid material
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Describe the Crust
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thin layer, made of basalt, forms outer layer of earth.
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Describe the Inner Core
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dense ball of solid material
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Describe the outer core
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layer of molten metal, behaves like a thick liquid
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How does the pressure change from the crust to the core?
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it gets heavier
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How does the temp. change from the crust to the core?
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It gets hotter
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What parts of the earth are solid?
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crust,mantle, litosphere, inner core
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What parts of the earth are liquid?
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outer core
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What part act like tar?
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Asthenosphere
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What causes the earth's madnetic field and what is unusual about the field?
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Liquid currents in the outer core force inner core to spin. Inner core spins faster then rest of planet. Planet act like magnet.
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Heat energy always moves from _____ to _____
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warm : cold
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