Plate Tectonics 1

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The process in which old ocean floor is pushed away from a midocean ridge by the formation of new ocean floor

The theory that a land bridge once stretched across the Atlantic Ocean and connected South America and Africa is supported by evidence from

The underwater mountains

The theory that continents were once joined together and have since drifted apart

A fault that runs across a midocean ridge

The theory that the Earth's plates are moving; links together the ideas of continental drift and ocean-floor spreading

The single, giant landmass that existed more than 200 million years ago

A deep, V-shaped valley