Why does the East Coast of the U.S. have wide continental shelf but the West Coast does not?
West Coast has a cold water current, and Easy has a warmer water current
b. West coast is on the boarder of a tectonically active area "ring of fire" in which plates collide and are subducted under each other
c. West Coast is on the boarder of new growth plates and east coast is old growth. Lava did not work the same with old growth.