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Ocean Bottom
Chapter 3
Will lead to unlocking some of the mysteries of the ocean and may give insight into Earth’s past
Bathygraphic features
Underwater physical features Mountain ranges Canyons Valleys
Two Major Features of the Ocean Bottom
The Continental Margins The region beneath the
____________zone The Ocean Basin
The _____________of the ocean beyond the continental margin
Continental Margins
The continental shelf Shallow
submerged_____________________ The continental slopes
__________________between the continental shelf and the deep floor of the ocean
Continental Margins continued
Submarine Canyons Probably formed by _________on
land during periods of_________________
Continental Rise A gentle slope at the base of a
steep______________________
Ocean Basin
Four main ocean basins Pacific Atlantic Indian Arctic
Antarctic (also considered to be an ocean)
Geological formations found in Ocean Basins
Abyssal Plains and Hills _____________- flat expanse of the
ocean basin ______________ – as high as 1,000
meters (3,300 feet) Seamounts
Formed from underwater_____________
Found mostly in the Pacific Ocean
Geological formations found in Ocean Basins
cont. Ridges and Rises A continuous series of large,
underwater, volcanic mountains runs through every ocean of the world
Trenches – most common in the Pacific Ocean Mariana Trench
The deepest of all ocean trenches – The _____________________is 11,020 meters (6.85 miles) deep. The deepest spot on earth
Island arcsChains of volcanic islands usually associated with trenches
the mid-ocean ridge is the largest single geological feature on the
Earth's surface.
the Mid-Ocean Ridge is an underwater series of mountain ranges that snakes 40,000 miles (64,000 kilometers) around the globe, from the Arctic, through the Atlantic Ocean, the Indian Ocean and across the Pacific Ocean.
the highest peaks rise ____________feet (3,000 meters) above the sea floor.
Life on the Ocean Floor
Continental Shelf Shallow Sunlight________________________ High levels of
_________________wash in from the continent
High levels of ________________and nutrients makes the area very productive and marine life is __________________on the continental shelf
Life on the Ocean Floor cont.
Abyssal Plain Deep water No sunlight, no__________________ Food production is by way of
_______________________bacteria in vent communities
Life is not abundant on the ocean floor because____________________________