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Science Vocab

TermDefinition
Fossil the preserved remains or traces of ancient organisms
Pangaea the single giant landmass that existed more than 200 million years ago and that gave rise to the present day continents
Theory of Continental Drift the theory, proposed by Alfred Wegener, that the continents were once joined together and have since drifted apart
Mid-ocean Ridge an undersea mountain chain where new ocean floor is produced; a constructive (divergent) plate boundary
Ocean Floor Spreading the process in which old ocean floor is pushed away from a mid-ocean ridge by the formation of new ocean floor
Transform Fault a fault that runs across a mid-ocean ridge
Trench a V-shaped valley on the ocean floor where old ocean floor is subducted; a destructive (convergent) plate boundary
Subduction the process in which crust plunges back into the interior of the Earth
Theory of Plate Tectonics the theory that links together the ideas continental drifting and ocean floor spreading and explains how the Earth has changed over time
Tectonics the branch of geology that deals with the movements that shape the Earth's crust
Lithosphere the topmost solid part of the Earth, which is composed of the crust and some of the mantle
Divergent Boundaries a plat boundary at which plates move apart
Convergent Boundaries a plate boundary at which plates come together
Strike-slip Boundaries a plate boundary at which two plates slip past one another horizontally
Convection Currents a movement of materials caused by differences in temperature
Created by: Erin M