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
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Slide1
The Ocean Floor --subsurface topography--
Ch
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
Water pressure
Water Pressure
demo
(with 2L bottle)Water pressure increases with depth
part of TitanicSlide4
Continental MarginSlide5
>>submarine canyons caused by erosion and underwater landslidesSlide6
ABYSSAL PLAINFlat area of ocean floorSlide7
Mid-Ocean Ridge
Divergent boundary
Sea-floor spreading
New sea floor formedSlide8
What do you notice about the shape of the mid-Atlantic ridge?Slide9
Seamount
Underwater volcanoes
If they reach the surface they form islands, like Iceland.
FYI—called guyots if flat-topped (due to erosion)Slide10
IcelandSlide11
TRENCH
At
convergent
boundaryEx: the Mariana Trench is the deepest known place on earth ---11034 meters (36200 ft) deepSlide12
Features of the Ocean Floor
(website—needs sound)Slide13
The Ocean Floor
Continental shelf
Seamount
Volcanic island
Continental slope
Continental shelf
Continental
slope
Abyssal plain
Mid-ocean ridge
TrenchSlide14
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
subduction
zone)Slide15
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?
….continental slope
QuestionsSlide17
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
A.
a
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?
Point BSlide20
Which is most like a mountain RANGE?
A. A seamount
B. A
guyotC. The abyssal plainD. The mid-ocean ridgeNote: A seamount is a single underwater mountain.