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