a. d. c. b. draw and label the parts of a wave. how is the ocean floor studied??
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A.
D.
C.
B.
Draw and Label the Parts of a Wave
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How is the ocean floor studied??
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SonarSOund NAvigation and RangingSonar signal sent to ocean floor and time how
long it takes to reach bottom and return to surface
Side scan sonar – technique that directs sonar waves at an angle
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Calculating Depth
D = (1500 m/s) (time / 2)1500 m/s = speed of sound in water
If sound signal takes 4 seconds how far away is the ocean floor at that location?
D = (1500 m/s) (4s / 2)
D = (1500 m/s) (2s)
D = 3000 m
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SubmersiblesDeep Diving Submersible
2-3 person vesselCan reach moderate to deep depths
Excellent horizontal movement
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Self Contained Diving1940s - Developed first
practical scuba (aqua lung)
Released compressed air when diver inhaled
Divers could swim freely rather than walk along bottom
SCUBA= Self Contained Underwater Breathing Apparatus
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Ocean FloorContinental Margin
Area where the edges of the continents meet the ocean
Shallowest part of oceanIncludes:
Continental ShelfContinental SlopeContinental Rise
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Continental ShelfShallowest part of continental marginExtends into ocean from shoreAverage width is 60 kmDepth of water – 130 m
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Continental SlopeQuick drop in the seafloorTrue edge of continent
Turbidity Currents – Fast moving water currents along sea floor that carve out submarine canyons
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Continental RiseGently sloping
accumulation of sediment at the bottom of the continental slope
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Abyssal PlainsFlattest part of the ocean floor5 to 6 km below surface
SeamountsUnderwater basaltic volcanoes
GuyotsLarge, extinct, volcanoes with flat
submerged tops
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Mid-ocean Ridge
Underwater chain of mountainsMid-Atlantic Ridge
Deep Sea Trenches
Deep Elongated DepressionsMarianas Trench
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Name _________________________________________________________ Date _________
Directions: Label the following diagram using the words listed below:
Continental Shelf Continental Slope VolcanoSeamounts Mid Atlantic Ridge Abyssal Plain
Trench