Science

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continental drift

The continents slowly drifting over Earth’s surface

Pangaea

supercontinent with every continent connected.

fossil

any trace of ancient organism that has been preserved in rock

mid-ocean ridges

a crack in the ocean floor where magma comes up to regenerate the ocean floor

Sonar

a device used to bounce sound waves off underwater objects and then records the echoes of these sound waves

sea floor spreading

The process in which the ocean floor regenerates and pushes the continents

deep ocean trenches

a deep valley along the ocean floor where oceanic crust slowly sinks back to the mantle

subduction

when ocean floor sinks beneath a deep ocean trench and back into the mantle