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Unit 3 lessons 1-2

TermDefinition
Crust Earth's thin, outer shell.
Mantle The layer below the crust.
Core The center of the earth.
Lithosphere The outermost physical layer of the earth.
Asthenosphere The solid thin layer of mantle material below the lithosphere.
Mesosphere The lower part of the mantle.
Seismic wave Earthquakes release waves of energy that travels through rock.
Continental drift The hypothesis that a single large mass of land broke to form continents, and drift farther away .
Plate tectonics The theory that earth's outer layer is made of large, moving pieces.
Theory A system of ideas that explains Many related observations that's supported by a large body of evidence.
Sea-floor spreading The process when the lithosphere is formed by cooling magma.
Subduction The process when lithospheric plates move on top of another causing tectonic action.
Magnetic reversal When the north and south poles of the earth switch periodically.
Convenction current Any movement of matter that results results in difference in density.
P waves Travel through solids, liquids, and gasses.
S waves Travel only through solids.
Created by: sc203230
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