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Geology

Unit 7 Geology

QuestionAnswer
plate A rigid, but moving piece of the earth's crust.
Plate Tectonics theory The theory of the formation and movement of the plates that cover the Earth's surface.
Continental Drift Hypothesis that earth's continents have slowly moved over time.
divergent boundary A plate boundary where two plates move away from each other.
convergent boundary A plate boundary where two plates move toward each other.
transform boundary A plate boundary where two plates slide past each other.
fault A break in the earth's crust.
rift valley A deep valley that forms at a divergent plate boundary.
convection current The circular movement of a liquid or gas substance caused by differences in temperature. (ex. lava lamps)
trench Deep oceanic valley that forms where oceanic plates are subducting.
mid-ocean ridge Underwater chain of mountains that forms at divergent plate boundaries.
Alfred Wegener The scientist who developed the idea of continental drift.
Pangaea The name of a single landmass that broke apart 225 million years ago.
subduction The process in which an oceanic plate sinks beneath a less dense plate at a convergent plate boundary.
seafloor spreading The process by which new ocean floor is being created at divergent plate boundaries.
topographic map Maps that show contour lines for elevation.
contour line A line that connects points of equal value. On a topographic map these lines connect points of equal elevation.
delta A landform usually in the shape of a bird's foot created by the deposition of sediment at the mouth of a river.
Earthquake The rapid movement at a plate boundary or fault that releases waves of energy across the earth.
Created by: dmiles
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