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Transcript
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 plates. 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.