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Because of this velocity difference, it is assumed that the two types of crust are
made up of different kinds of rock. Seismic P waves travel through oceanic crust
at about 7 kilometers per second, which is also the speed at which they travel ...
(A) Structure of oceanic crust, determined from seismic studies and drilling.
Gabbro and ultramafic rock drilled and dredged from sea-floor fault blocks may
be from Layer 3 and the mantle. (6) Typical ophiolite sequence found in mountain
As the sea floor is subducted, the ocean becomes narrower and narrower until
the continents eventually collide. ... In each case the spreading creates new
oceanic crust that is similar, but not identical, to the oceanic crust formed at the
crest of ...
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Introduction to Physical Geology
Terms to Remember 382
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