Voc 21
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Ocean basin
Large bowl shaped depression that holds ocean water;regions of crust below sea level
Seafloor spreading
Formation of new oceanic crust due to the upwelling of magma at mid ocean riges
Subduction zone
Formed at convergent plate boundary .one plate is lighter than the other causing the thinner denser plate to be driven down into the mantle
Mid ocean ridge
Under sea mountain ranges formed where to parts of the earths crust are moving apart
