1. Draw and Label the Parts of a WaveC. B.

2. How is the ocean floor studied??

3. 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

4. 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

5. 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

6. 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

7. 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

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

9. 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

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

11. 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

12. 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

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