plate tectonics9q
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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| Asthenosphere | Plastic like layer of Earth on which the lithospheric plates float and move around.
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| Continental Drift | Hypothesis that continents were once connected in a single large land mass that broke apart about 200 mil. years ago.
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| Convection Current | Current in Earth's mantle that transfers heat in Earth inteior and is the driving force for plate tectionics.
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| Lithosphere | Rigid layer of Earth about 100km thick, made of the crust and part of the upper mantle.
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| Pangaea | largte ancient landmass that was composed of all the continents joined together.
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| Plate | a large section of Earth's oceanic or continental crust and rigid upper mantle that moves around on the asthenosphere.
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| Plate Tectonics | Theory that Earth's crust and upper mantle are broken into plates that float and move around on a plasticlike layer of the mantle.
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| Seafloor spreading | Theory that new seafloor is formed when magma is forced upward toward the surface at a mid ocean ridge.
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| Who theory was seafloor spreading? | Hess
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| Who theory was continental drift? | Wegener
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| Subduction Zone | Area where an oceanic plate goes down into the mantle.
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| Divergent Boundary | Boundary between two plates that are moving apart.
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| Convergent Boundary | Boundary between two plates that are moving together.
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| Transform Boundary | Plate boundary that occurs when two plates slide past one another.
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| Magneticometer | Sensing device that detects magnetic fields, helping to confirm seafloor spreading.
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| Mantle | Largest layer of Earht's surface, composed mostly of silicon, oxygen, magnesium, and iron
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| Crust | Outer most layer of Earth's surface.
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| Convergent boundarys form | deep sea trenches, volcanic islands, and colcanic mountains.
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| Divergent boundarys form | Mid ocean rifts, rift vally
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| Transform boundarys form | major earthquakes
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