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Earth's Structure C3

Continental drift, mid-ocean ridges, subduction, plate tectonics

TermDefinition
Alfred Wegener German scientist that created the theory of continental drift
Continental drift Wegener's idea that the continents slowly moved over Earth's surface over millions of years
Pangaea Wegener's name for the supercontinent
Fossil Any trace of an ancient organism
Glossopteris A fernlike plant that lived 250 years ago whose fossils have been found in Africa, South America, Australia, India and Antarctica
Mesosaurus, Lystrosaurus Freshwater reptiles whose fossils have been found in places now separated by oceans, supporting the theory of continental drift
Mid-ocean ridges Long chains of mountains that rise up from the ocean floor
Sonar A device that uses sound waves to measure the distance to an object
Sea-floor spreading The process that continually adds new material to the ocean floor
Deep-ocean trenches Underwater canyons that the old ocean floor sinks into during subduction
Subduction The process by which the ocean floor sinks beneath a deep- ocean trench and back into the mantle again
Divergent boundary A boundary where plates diverge, or move away from each other
Convergent boundary A boundary where plates converge, or come together
Transform boundary A boundary where plates slip past each other
Plate tectonics A theory that states that Earth's plates are in a slow, constant motion, driven by convection currents in the mantle
Plates Pieces of the Earth that make up the lithosphere and are separated by cracks
Faults Breaks in Earth's crust where rocks have slipped past each other
Rift Valley A deep valley on Earth formed when plates diverge on land
Created by: RabbitHopperBoy
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