Examlex
What role did metals play in Prehistoric times? Why has iron been called one of history's "key metals"? Furthermore, are these metals still useful today?
Continental Shelf
The extended perimeter of each continent, lying relatively shallow in the ocean, where the seabed is at a gentle slope before a steep drop off to the ocean floor.
Passive Margin
The transition between oceanic and continental lithosphere that is not an active plate boundary.
Oceanic Crust
The relatively thin part of the Earth's crust that underlies the ocean basins, composed mostly of basalt and gab-bro.
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