WORLD
OCEANS
70.8 % of Earth’s surface is covered by ocean.
29.2 % of Earth’s surface is covered by land.
SHOW:
1. Ocean Statistics ppt.
2. chapter01 introduction slide show
On your world map, label each ocean and include information about each.
PACIFIC OCEAN (50.1%)
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World’s largest ocean – more than half of Earth’s ocean space
Covers 32% of Earth’s surface
World’s deepest ocean
Earth’s largest geographic feature
Named in 1520 by Ferdinand Magellan
Average depth = 13,000 ft
ATLANTIC OCEAN (26.0%)
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Half the size of the Pacific Ocean
Shallower than the Pacific Ocean
Separates the Old World from the New World
Saltiest
Average depth = 12,000 feet
Deepest point – Puerto Rico Trench (28,000 ft)
Mid-Atlantic Ridge – significant feature of sea floor stretches from north polar
region to southern ocean.
INDIAN OCEAN (20.5%)
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Smaller than the Atlantic Ocean
Similar depth as the Atlantic Ocean
Primarily in Southern Hemisphere
Deepest part is Java Trench
Site of deadly 2004 tsunami
Affected by monsoon wind systems causing rainy seasons.
ARCTIC OCEAN (3.4%)
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7 % the size of the Pacific Ocean
Shallowest world ocean
Permanent layer of sea ice a few meters thick
Lowest salinity
SOUTHERN OCEAN
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Circumnavigates Antarctica
Is really the parts of the Pacific, Atlantic, and Indian Ocean that lie south of 50° S
latitude
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Voted and accepted as a new ocean in 2000 by the International Hydrographic
Organization (IHO). Had been called the Southern Ocean by mariners for many
years.
THE SEVEN SEAS
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Smaller and shallower than oceans
Salt water
Usually enclosed by land
Sargasso Sea defined by ocean currents
Directly connected to the ocean
Some statistics:
Average ocean depth is 12, 234 ft. (3729 m)
Average height of land is 2756 ft. (840 m)
Marianas Trench is the deepest ocean trench at 36,161 ft deep (11,022 m)
Mt. Everest is the highest continental mountain at 29,035 ft (8850 m)
Why do we care about Oceanography?
 Energy
 Carbon cycle
Resources
 Biodiversity
 Hazards
 Climate
 New Model for life