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Chapter three

Lessons 1-3

QuestionAnswer
Continental drifts The hypothesis that the continents slowly move across Earth's surface.
Pangaea The name of a single landmass that began to break apart 200 million years ago and gave rise to today's continents.
Fossil The preserved remains or traces of an organism the lived in the past.
Mid-ocean ridge An undersea mountain chain where new ocean floor is produced ; a divergent plate boundary.
Sea-floor spreading The process by which molten material adds new oceanic crust to the ocean floor
Deep-ocean trench A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
Subduction The process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary.
Plate A section of the lithosphere slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
Divergent boundary A plate boundary where two plates move far away from each other.
Convergent boundary A plate boundary where two plates move toward each other.
Transformation boundary A plate boundary where two plates move past each other in opposite directions.
Plate tectonics The theory that pieces of Earth's lithosphere are in constant motion , driven by convection currents in the mantle.
Fault A break in Earth's crust along which rocks move .
Rift valley A deep valley that forms where two plates move apart.
Created by: user-1975075
 

 



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