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CMSScience8-Unit10

TermDefinition
Lithosphere Cool, rigid, outermost layer of Earth divided into enormous pieces called tectonic plates; consists of the crust and the rigid uppermost part of the mantle
Plate Tectonic Theory Theory the lithosphere is divided into tectonic plates that slowly move on top of the asthenosphere
Subduction A plate is forced below when one plate is denser than another as they converge
Continental Drift The theory continents were once connected but have drifted apart
Contour Line A line (as on a map) connecting the points having the same elevation on a land surface
Convergent Boundary The boundary between two tectonic plates moving toward each other
Divergent Boundary The boundary between two tectonic plates moving away from each other; on land creates rift valleys, on the sea floor created new ocean crust
Elevation Indicates the height of somehting in relation to sea level
Pangaea Hypothetical land area believed to have once connected all landmasses
Plate A large piece of the Earth’s crust
Seafloor Spreading A parallel pattern of rock material found at identical locations on each side of the Mid-Atlantic Ridge reveals rock of the same geologic age and polarity
Topographic Map A map showing changes in elevation of Earth's surface
Transform Boundary The boundary between two plates where they slide pass one another; sudden shifts result in major geological events such as earthquakes and the release of stored energy
Fault A crack in the lithosphere, resulting from movement
Trench A long narrow steep-sided depression in the ocean floor, ocurring at the point of subduction
Mid-Ocean Ridge An underwater mountain range, formed by plate tectonics
Rift Valley A long valley formed by a divergent boundary, when the sinking of the earth's crust between two parallel or nearly parallel faults or groups of faults
Created by: randyoliver
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