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Plate boundaries and ocean features Volcanic island arc Trench Coastal mountain range Seamount Hot spot MOR mid-ocean ridge Trench Mid-ocean ridge Divergent margin mid-ocean ridge ridge axis volcanic islands Offsets in the MOR Accommodation for a rigid plate moving on a curved surface Location of previous two images Equatorial Atlantic Ocean Fracture zone appears as a long linear wall and trough on the seafloor A triple junction in the Indian Ocean submarine plateau Location of previous image southern Indian Ocean A juvenile ocean opening and a terminal ocean closing closing (Persian Gulf) opening (Red Sea) triple junction Rifting of a continent to form an ocean basin Location of previous image northern Indian Ocean Deep-ocean basin Convergent margin Active volcanic island arc Oceanic plate colliding with another oceanic plate seamounts Abandoned volcanic island arc trench Location of previous image western Equatorial Pacific Ocean Convergent margin coastal mountains Oceanic plate colliding with a continent seamount chain Location of previous image northwestern Pacific Ocean & Bering Sea Convergent margin Which way are the plates moving? trench volcanic island arc Marginal plateau & transform boundary South American plate Falkland Plateau Patagonia Scotian plate Two plates sliding past each other Location of previous image southern Atlantic Ocean Convergent margin An oceanic plate always goes under a continental plate Eastern South Pacific & west coast of South America Seamounts A terminal ocean – closing Two continents squeezing an ocean basin Collision Continent colliding with another continent Regional uplift High plateau Tall mountains Hot spot creating a chain of islands older young hot spot Location of previous image central Pacific Ocean Hot spot at the mid-ocean ridge volcanic islands Provides extra magma to the spreading center Location of previous image North Atlantic Ocean LIP – Large Igneous Province Submarine plateau – created by a mantle plume Volcanic island Location of previous image southern Indian Ocean Continental margins Hudson Canyon St. Lawrence shelf valley Meltwater and lots of sediment from a continental glacier flowed down the Hudson River Hudson Canyon Hudson shelf valley Hudson Canyon Submarine fans or cones Orinoco River Amazon River Location of previous image Equatorial Atlantic Ocean Abyssal plain Hatteras Abyssal Plain marginal plateau – the Blake Plateau
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