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Dynamic Planet KT


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convergent boundary
A plate boundary where two plates move toward each other
rift valley
A deep valley that forms where two plates move apart
A break in Earth's crust where masses of rock slip past each other
deep-ocean trench
A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
A device that determines the distance of an object under water by recording echoes of sound waves
transform boundary
A plate boundary where two plates move past each other in opposite directions
A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust
scientific theory
A well-tested concept that explains a wide range of observations
divergnet boundary
A plate boundary where two plates move away from each other
plate techtonics
The theory that pieces of Earth_tm)s lithosphere are in constant motion, driven by convection currents in the mantle
The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
mid-ocean ridge
An undersea mountain chain where new ocean floor is produced; a divergent plate boundary
continental drift
The hypothesis that the continents slowly move across Earth's surface
A trace of an ancient organism that has been preserved in rock
The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
sea-floor spreading
The process by which molten material adds new oceanic crust to the ocean floor

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