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The Ocean Floor --subsurface topography--
13, section 2
(before the 1900’s scientists thought the ocean floor was completely flat)Slide2
Sonar (sound navigation and ranging)
--invented during WWI--
to find depth: use the formula:
depth= V x t (remember that you only want half the time)—units=meters…where velocity of sound in ocean water is about 1,500 m/sSlide3
(with 2L bottle)Water pressure increases with depth
part of TitanicSlide4
>>submarine canyons caused by erosion and underwater landslidesSlide6
ABYSSAL PLAINFlat area of ocean floorSlide7
New sea floor formedSlide8
What do you notice about the shape of the mid-Atlantic ridge?Slide9
If they reach the surface they form islands, like Iceland.
FYI—called guyots if flat-topped (due to erosion)Slide10
boundaryEx: the Mariana Trench is the deepest known place on earth ---11034 meters (36200 ft) deepSlide12
Features of the Ocean Floor
The Ocean Floor
3D model of ocean floor(as a group)
After you build the ocean floor, use toothpicks and sticky labels to identify the following ocean features:
1. continental shelf
2. continental slope3. MID-ocean ridge4. abyssal plain5. seamount6. trench—should not be right next to mid-ocean ridge
(should be at
Omit section 3, except:Slide16
If you were able to walk along the ocean bottom from a beach, which feature would you reach after the continental shelf?
The area under water that is closest to the shoreline is the
A. continental shelf
B. continental slope
C. mid-ocean ridgeD. benthic Slide18
The __________ is the broad, FLAT part of the deep-ocean basin
byssal plainB. continental shelfC. mid-ocean ridgeD. benthic Slide19
At which point in the diagram above would hot magma most likely rise through the ocean floor to eventually form a volcanic island?
Which is most like a mountain RANGE?
A. A seamount
guyotC. The abyssal plainD. The mid-ocean ridgeNote: A seamount is a single underwater mountain.
Floor subsurface topography Ch 13 section 2 before the 1900s scientists thought the ocean floor was completely flat Sonar sound navigation and ranging invented during WWI to find depth use the formula ID: 461904 Download Presentation