2 intro oceans and seas


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2 intro oceans and seas

  1. 1. Introduction to Oceanography © 2011 Pearson Education, Inc.
  2. 2. Overview The world ocean is the most prominent feature on Earth. Oceans cover 70.8% of Earth’s surface. The origin and development of life on Earth is connected to the ocean. The oceans have a long history on Earth. © 2011 Pearson Education, Inc.
  3. 3. Earth’s Oceans Earth has one ocean. It is divided into four principle oceans, and one other.  Pacific Ocean  Atlantic Ocean  Indian Ocean  Arctic Ocean  Southern, or Antarctic Ocean © 2011 Pearson Education, Inc.
  4. 4. OCEANS
  5. 5. Ocean Size and Depth © 2011 Pearson Education, Inc.
  6. 6. Earth’s Oceans1) Pacific Ocean a. World’s largest ocean i. Accounts for more than half of Earth’s ocean space b. World’s deepest ocean c. Earth’s largest geographic feature d. Named in 1520 by Ferdinand Magellan
  7. 7. Earth’s Oceans2) Atlantic Ocean a. Half the size of the Pacific Ocean b. Shallower than the Pacific Ocean c. Separates the Old World from the New World © 2011 Pearson Education, Inc.
  8. 8. Factoids:• Average depth of the Atlantic Ocean is 12,000 feet.• The greatest depth is 28,374 feet (Puerto Rico Trench).
  9. 9. Earth’s Oceans3. Indian Ocean a. Smaller than the Atlantic Ocean b. Similar depth as the Atlantic Ocean c. Primarily in the Southern Hemisphere © 2011 Pearson Education, Inc.
  10. 10. • The Mid-Atlantic Ridge divides the sea floor nearly through the center andstretches from the polar regions of the North to Antarctica in the South.
  11. 11. Earth’s Oceans4. Arctic Ocean a. Seven percent the size of the Pacific Ocean b. Shallowest world ocean c. Permanent layer of sea ice a few meters thick5. Other…Southern Ocean or Antarctic Ocean a. Circumnavigates Antarctica b. Is really the parts of the Pacific, Atlantic, and Indian Oceans that lie south of 50 S latitude © 2011 Pearson Education, Inc.
  12. 12.  Factoid: Centered approximately on the North Pole, the ARCTIC Ocean is the smallest of the worlds oceans.
  13. 13. ARCTIC OCEANFactoid: Maximum depth is 18,050 feet. The Arctic Ocean is divided into two nearly equal basins: The Eurasia basin & the Amerasia basin.
  14. 14. The Seven Seas Smaller and shallower than oceans Salt water Usually enclosed by land  Sargasso Sea defined by surrounding ocean currents Directly connected to the ocean © 2011 Pearson Education, Inc.
  15. 15. The Seven Seas Before the 15th Century, Europeans considered the seven seas to be the following: 1. Red Sea © 2011 Pearson Education, Inc.
  16. 16. 2. Mediterranean Sea
  17. 17. Turkey Cyprus SyriaMediterranean Sea Africa
  18. 18. 3. Persian Gulf
  19. 19. 4. Black Sea
  20. 20. 5. Adriatic Sea
  21. 21. 6. Caspian Sea
  22. 22. 7. Indian Ocean
  23. 23. Comparing Oceans to Continents Average ocean depth is 3729 meters (12,234 feet) Average continental elevation is 840 meters (2756 feet) Deepest ocean trench is the Mariana Trench at 11,022 meters (36,161 feet) Highest continental mountain is Mt. Everest at 8850 meters (29,935 feet) © 2011 Pearson Education, Inc.