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Science Words

Across
A section of the lithosphere that slowly moves over the asthenosphere carrying pieces of continental and oceanic crust
A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
A break or a crack in earths lithosphere along which the rocks move
A plate boundary where two plates move past each other in opposite directions
The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
A plate boundary where plates move toward each other
The name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
An undersea mountain chain where new ocean floor is produced
The theory that pieces of Earth's lithosphere are in constant motion driven by convection currents in the mantle
Down
A section of the lithosphere that slowly moves
The process by which molten material adds new oceanic crust to the ocean floor
A deep valley that forms where two plates move apart
The hypothesis that the continents slowly move across Earth's surface
A device that determines the distance of an object under water by recording echoes of sound waves
A trace of an ancient organism that has been preserved in rock