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12 Cards in this Set
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- Back
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Continental Drift
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A hypothesis that states that continents have moved horizontally around the globe, over time, to reach their current locations.
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Pangaea
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A large land mass made up of all the continents before it broke up to what are the continents of today.
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Seafloor Spreading
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The theory that magma from the earth's mantle rises to the surface at mid-ocean ridges and cools to form new sea floor, which pushes the older floor away.
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Magnetometer
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A sensitive instrument that's used to measure magnetic data, and is used to measure the earth's magnetic field.
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Plate Tectonics
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The theory that the earth's crust and upper mantle (lithosphere) are broken into sections, called plates, and move slowly above the mantle.
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Plates
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Sections of the earth's crust that move above the upper mantle.
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Lithosphere
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The rigid, outer most layer of the earth, about 100km thick, composed of the crust and part of the mantle.
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Asthenoshpere
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The plastic-like layer below the lithosphere in the earth's mantle.
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Divergent Boundary
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A boundary between two plates that are diverging, or moving away from each other.
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Convergent Boundary
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The boundary between two plates that are converging, or moving away from each other.
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Subduction Zone
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The area where an ocean floor plate collides with a continental plate, and the denser ocean plate sinks under the continental plate.
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Convection Current
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A driving force in which hot, plasticlike material material from the mantle rises to the lithosphere, moves horizontally, cools, and sinkes back to the mantle.
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