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Pangea
Ancient landmass made up of all the continents that began to break apart about 200 mya
Continental Drift
Wegener’s hypothesis that Earth’s continents were joined as a single landmass, that broke apart about 200 mya and slowly moved
Continental shelf
Shallowest part of a continental margin, that extends into the ocean from the shore and provides a nutrient-rich home to fish
Continental slope
Sloping oceanic region found beyond the continental shelf that marks the edge of the continental crust
Deep-Sea Trench
Elongated, sometimes arc-shaped depression in the seafloor; is the deepest part of the ocean
Mid-Ocean Ridge
Chain of underwater mountains that run throughout the ocean basins, and can contain active and extinct volcanos
Seafloor Spreading
The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches
Magnetometer
Device used to map the ocean floor that detects small changes in magnetic field
Magnectic Reversal
When Earth’s magnetic field changes polarity between normal and reversed
Isochron
Imaginary line on a map that shows points of the same age; formed at the same time