Draw and Label the Parts of a Wave C. B.

How is the ocean floor studied??

Sonar SOund NAvigation and Ranging Sonar 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

Submersibles 2-3 person vessel Can reach moderate to deep depths Deep Diving Submersible 2-3 person vessel Can reach moderate to deep depths Excellent horizontal movement

Self Contained Diving 1940s - 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 Floor Continental Shelf Continental Slope Continental Rise Continental Margin Area where the edges of the continents meet the ocean Shallowest part of ocean Includes: Continental Shelf Continental Slope Continental Rise

Continental Shelf Shallowest part of continental margin Extends into ocean from shore Average width is 60 km Depth of water – 130 m

Continental Slope Quick drop in the seafloor True edge of continent Turbidity Currents – Fast moving water currents along sea floor that carve out submarine canyons

Continental Rise Gently sloping accumulation of sediment at the bottom of the continental slope

Abyssal Plains Flattest part of the ocean floor 5 to 6 km below surface Seamounts Underwater basaltic volcanoes Guyots Large, extinct, volcanoes with flat submerged tops

Underwater chain of mountains Mid-Atlantic Ridge Mid-ocean Ridge Underwater chain of mountains Mid-Atlantic Ridge Deep Sea Trenches Deep Elongated Depressions Marianas Trench

Name _________________________________________________________ Date _________ Directions: Label the following diagram using the words listed below: Continental Shelf Continental Slope Volcano Seamounts Mid Atlantic Ridge Abyssal Plain Trench