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
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.
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