ch 6Plate Techtonics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| inner core | a ball of hot, solid metals
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| outer core | a layer of liquid metals that surrounds the inner core
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| mantle | Earth's thicest layer, measuring nearly 2900 kilometers
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| mantle | made of hot rock that is less dense than the metallic core
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| crust | thin layer of cool rock
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| crust | surounds the Earth like a shell
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| inner core and outer core | makes up the core of the Earth
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| lithosphere | earth's crust and the very top of the mantle together form this
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| asthenosphere | what the lithosphere sits on top of
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| asthenosphere | a layer of hotter, softer rock in the upper mantle
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| tectonic plates | what the lithosphere is broken into; includes many large and small slabs
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| continental drift | proposed by Wegener; hypothesis that says the Earth's continents were once joined in a single landmass and gradually moved or drifted apart
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| fossils, climate, and geology | evidence for the continental drift theory
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| Pangea | comes from the Greek word, "all lands"
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| Pangea | the huge supercontinent
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| mod ocean ridges | huge underwater montain ranges
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| sea floor spreading, age of the sea floor, and ocean trenches | evidence that the sea floor is spreading
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| convection | energy transfer by the movement of a material
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| convection current | a motion that transfers heat energy in a material
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| theory of plate tectonics | what geologist developed using a combination of their knowledge of Earth's plates, the sea floor, and the asthenosphere
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| divergent boundary | occurs where plates move apart
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| convergent boundary | occurs when plates push together
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| transform boundary | occurs where plates scrape past each other
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| plate boundary | where the edges of two plates meet
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| rift valley | a gap developed as ridges continue to widen
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| magnetic reversal | the switch in direction of the Earth's magnetic poles; the north pole becomes the south pole and the south pole becomes the north pole
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| hot spots | places where heated rock rises in plumes or thin columns from the mantle
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| subduction | a process in which one plate is led under another
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| continental-continental collision | occurs where two plates carrying continental crust push together
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| continental-continental collision | becuase both crusts are the same density, neither plate can sink beneath the other
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| oceanic-oceanic subduction | occurs where one plate with ocean crust sinks or subducts under another plate with oceanic crust
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| oceanic-oceanic subduction | the older plate sinks because it is colder and denseer than the younger plate
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| deep ocean trenches | like deep canyons that form in the oean floor as a plate sinks
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| Island arcs | chains of volcanic islands tht form on the top plate, parallel to a deep ocean trench
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| oceanic-continental subduction | ocurs when ocean crust sinks under continental crust
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| oceanic-continental subduction | oceanic crust sinks becuase it is colder and denser than the continental curst
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| deep ocean trenches | occur mostly in the Pacific Ocean and the crust movement results in underwater earthquakes
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| coastal mountains | as the oceanic crust sinks under a continent, the continental crust buckles to form a range of mountains
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Created by:
fhershey
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