Oceanography Exam 1

Question Answer
Marine Science
Discovering and unifying principles in data obtained from the Ocean and it's associated life forms and bordering lands.
Earth facts Covered 71% by water
61% N. Hemisphere
815 S. Hemisphere
Ocean stats Average depth 12,451' (3800m)
Max depth 36.000' (11,000m)
Average Temp. 39f (3.9c)
Ocean a body of saline water occupying depressions in the Earth's surface
4 Primary Sub-Divisions of Marine Science (Which are often inter-related) Geological- Earth's crust
Chemical- Gasses, how solids are dissolved into water.
Physical- Waves, Currents, Climate
Biological- Living marine organisms
Science The systmatic process of asking questions about the observable world by gathering and studying information.
Scientific Method A) Observation
B) Hypothesis
C) Test
D) Conclusion
Hypothesis A speculation proved through controlled experiments.
Early Marine Science was built out of ______? Necessity
Historically speaking, the Eqyptians And trade vessels on the Nile in 100 BC
Historically speaking, the Greeks Had the first ship sail across the Atlantic. 900-700BC
Greeks also discovered North south Currents named (Okeeanos)River.
Polynesia and China where also players in Sea Voyage none
Cartographers Chart makers, recorded info on locations, landmarks and currents. Most early expeditions had a cartographer aboard
Maps are to land, as charts are to _____? Water based info. Currents, reef, coasts.
When was the Library of Alexandria founded? 3rd Century B.C. It housed information an all aspects of hunam endeavor.
Celestial Navigation Using the stars to navigate. Developed at Alexandria.
1st to measure the Circumference of the Earth Eratosthenes and it measured 40,070 km
Circumference of the Earth was later improved by who? Ptolemy, and he measured it at 28,800km, much more accurate.
1st person to chart lines of latitude through landmarks of the time? Eratosthenes
The earth was later divided into equal units at 360 degrees. Hipparchus (165-127 B.C.
He added North to maps, so people would always know which way was north. Ptolemy
Lines of Longitude unlike Latitude? Are not parallel
The Prime Meridian is located where? Greenwich, England
Degrees for Navigation 0 north
90 east
270 south
135 south-east
360 west

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