A.
D.
C.
B.
Draw and Label the Parts of a Wave
How is the ocean floor studied??
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
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
SubmersiblesDeep Diving Submersible
2-3 person vesselCan reach moderate to deep depths
Excellent horizontal movement
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
Ocean FloorContinental Margin
Area where the edges of the continents meet the ocean
Shallowest part of oceanIncludes:
Continental ShelfContinental SlopeContinental Rise
Continental ShelfShallowest part of continental marginExtends into ocean from shoreAverage width is 60 kmDepth of water – 130 m
Continental SlopeQuick drop in the seafloorTrue edge of continent
Turbidity Currents – Fast moving water currents along sea floor that carve out submarine canyons
Continental RiseGently sloping
accumulation of sediment at the bottom of the continental slope
Abyssal PlainsFlattest part of the ocean floor5 to 6 km below surface
SeamountsUnderwater basaltic volcanoes
GuyotsLarge, extinct, volcanoes with flat
submerged tops
Mid-ocean Ridge
Underwater chain of mountainsMid-Atlantic Ridge
Deep Sea Trenches
Deep Elongated DepressionsMarianas Trench
Name _________________________________________________________ Date _________
Directions: Label the following diagram using the words listed below:
Continental Shelf Continental Slope VolcanoSeamounts Mid Atlantic Ridge Abyssal Plain
Trench