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11.1 Ocean Basins – Student Notes
Ocean Basins
 The surface of the ocean floor is as _______ as the land.
 The five major oceans, from ____________to ____________, are :
 the _____________
 the _____________
 the _____________
 the______________
 the _____________
 The low points in the oceans are called ____________.
 Oceans are vital to life, as they control ____________, create weather ____________and
provide water for water cycles.
The Origin of Ocean Water
 Oceans have __________ over hundreds of millions of years.
 Scientists believe the oceans are more than ____________ years old.
 Water may have originally been released from ______________________________, or arrived
on Earth via ____________________________.
Features of the Ocean Floor
 Although the word “__________” makes it sound flat, many features found on land, including
mountain ranges, valleys, flat plains, canyons, and volcanoes also exist on the _____________
 The __________ is the large, flat middle part, while the _______________________________
are the edges rising up to the land.
Ocean Basins
 The largest changes to the ocean basin occur through the movement of ___________________,
although there is also ___________ via storms, earthquakes and icebergs.
 _____________________ occur where new rock is forced up, and ocean floor spreads outward.
 The _____________________________ is the largest example on Earth.
 The Juan de Fuca plate lies __________ off Vancouver Island.
 A ___________forms when the dense oceanic plates run into, and slide under, the continental
Ocean Basins (continued)
 __________________ are the pieces of oceanic crust between a spreading mid-ocean ridge and
the trench it disappears into.
 These make up _________of the Atlantic sea floor, and _________ of the Pacific seafloor.
 Abyssal plains can be covered in__________________________________.
 ________________________ are old volcanic mountains found on abyssal plains. The Hawaiian
Islands are an example.
Continental Margins
 Continental margins are part of _____________________________.
 Continental margins are made up of a ____________________________ (averaging 80 km wide)
and a _____________________________ down to the oceanic plate.
 Continental shelves were above water during the last ice age.
 ____________________________________are slides on the slopes, and can create large
____________________________________ in the shelf.