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Plate Tectonics

Alfred Wegener The German scientists who in 1912 developed the theory of continental drift later to be known as plate tectonics.
Transform Boundary A plate boundary where two plates slide horizontally past each other.
Divergent Boundary A plate boundary where two plates move aways from each other.
Plate Tectonics The theory that pieces of the Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.
Sea-Floor Spreading The process by which molten material adds new oceanic crust to the ocean floor.
Mid-Ocean Ridge The undersea mountain chain where new ocean floor is produced by a divergent boundary.
Continental Drift The hypothesis that the continents slowly move across the Earth’s surface developed by Alfred Wegener.
Convection The transfer of heat by movements of a heated fluid.
Convection Current The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another. This happens in the mantle.
Deep Ocean Trench Deep valleys along the ocean floor through which oceanic crust slowly sinks towards the mantle.
Fault A break in the Earth’s crust where slabs of rock slip past each other.
Convergent Boundary A plate boundary where two plates move towards each other.
Pangea Hypothetical land area believed to have once connected nearly all of the Earth's land masses together.
Tsunami A large ocean wave that is caused by sudden motion on the ocean floor. This sudden motion could be an earthquake, a powerful volcanic eruption, or an underwater landslide.
Created by: Mrs_Irish