IV. DIVISIONS IN THE OCEAN (see diagram pg. 9)

• A. CONTINENTAL

• 8% of the surface area of the world ocean is the continental margin

• canyons in the ocean may be found at the mouths of rivers.

Google Earth

B. DEEP OCEAN

• Trace profile from book

Seafloor Features: Deep Ocean• seamounts - underwater volcanoes 500 m to

1000 m high– flat-topped ones are called guyots– volcanic features (buoyed up by hot rock, lava)

• abyssal hills - features around 200 m high– pervasive on seafloor– volcanic AND tectonic in origin - still debated

V. TOOLS FOR MEASURING • A. SHALLOW- SCUBA self contained

underwater breathing apparatus.• peripheral vision 180 degrees down to 80

degrees "tunnel vision"• magnification of 33% 12 ft. looks 8 ft. away• color distortion with depth (pg. 53 in library

oceanography book) • pressure increase w/ depth 1

atm per 10m 33 ft.

Bends and Nitrogen Narcossis

• SOLVE PROBLEMS USING PRESSURE CHANGES

B. DEEP OCEANshow video from unitedstreaming about surveying the ocean floor

• -----old--- rope and weight

• ---new--- echo sounding

• SONAR (sound navigation and ranging) Used in lake Erie to monitor the erosion of land from the Ohio side. Echo Sounding Navy 1922

• Read Bathymetry lab

TEST TOPICS

• Bathymetry, Plate tectonics, Oceanographers, Oceans characteristics, plot longitude and latitude,

• Scuba and pressure calculations,

• pgs. 1-15

• Geographic features, Continental Drift

• REVIEW PRACTICE SHEET