Vocabulary
Terms
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- plate techtonics
- theory that a pieces of earths lithosphere is in constant motion and is driven by convection currentsin the mantle
- deep-ocean trench
- a deep valley along the ocean floor through which oceanic crust slowly sinks toward the mantle
- rift valley
- a valley that forrms where 2 plates move apart
- sea floor spreading
- process by which molten material adds new oceanic crust to the ocean floor
- mid-ocean ridge
- undersea moutain range that creates new sea-floor
- subduction
- process in which oceanic crust sinks beneath deep ocean trenchand back into the mantle at the convergent plate boundary
- fault
- a break or crack in the earths lithospere along which rock moves
- transform boundary
- boundary where 2 plates slide in opposite directions
- convergent boundaries
- boundary where 2 plates move toward each other
- divergent boundary
- boundary where 2 plates move awy from each other