1. AN OCEAN WORLD. Click HereClick Here!

2. GENERAL INFORMATION About 71% of Earth’s surface is ocean About 71% of Earth’s surface is ocean Avg depth of 3800 m. Avg depth of 3800 m. Major ocean basins Major ocean basins – Atlantic – Pacific – Arctic – Indian – Southern

3. GENERAL INFORMATION The oceans affect every aspect of life on Earth. The oceans affect every aspect of life on Earth. Scientists believe, and there is a lot of evidence showing, that life may have begun in the oceans. Scientists believe, and there is a lot of evidence showing, that life may have begun in the oceans. http://www.youtube.com/watch?v=BvrzM-BavDg&feature=related

4. How did our oceans form? 1. Sun stripped away Earth’s 1st atmosphere 2. Volcanic gases, including water vapor, replaced the 1st atm. 3. Water vapor condensed into clouds. 4. Hot rain fell & boiled back into the clouds. 5. Eventually, the surface cooled enough for water to collect in low-lying areas. 6. Comets crashed into Earth, releasing more water. See What They Say Happened…

5. PACIFIC ATLANTIC PACIFIC ATLANTIC ½ all ocean area ½ all ocean area 1/3 of Earth’s surface 1/3 of Earth’s surface Circular shaped Circular shaped Deepest trench- Marianas Trench Deepest trench- Marianas Trench Many chains of active volcanoes around the edges…..”Ring of Fire” Many chains of active volcanoes around the edges…..”Ring of Fire” Many islands Many islands Narrow/ S shaped Narrow/ S shaped Relatively shallow Relatively shallow Mid-Atlantic Ridge runs the entire length Mid-Atlantic Ridge runs the entire length Few Islands - largest is Greenland Few Islands - largest is Greenland

6. INDIANARCTIC All in S. Hemisphere except northern tip All in S. Hemisphere except northern tip Triangular-shaped Triangular-shaped Apex- India Apex- India Earliest mariners were Egyptians Earliest mariners were Egyptians Shallow & small Shallow & small Separated from Atlantic by a ridge Separated from Atlantic by a ridge Surface covered by sea ice Surface covered by sea ice Least studied- inhospitable weather & permanent ice pack Least studied- inhospitable weather & permanent ice pack North Pole is in its domain North Pole is in its domain

7. SOUTHERN Encircles Antarctica Encircles Antarctica Enclosed by the Antarctic Circumpolar Current Enclosed by the Antarctic Circumpolar Current Iceburgs Common Iceburgs Common High wind & waves helps keep sea ice from forming High wind & waves helps keep sea ice from forming Very biologically productive! Very biologically productive!

9. Mysterious Ocean World Watch this video of the ocean IN SILENCE. Then, imagine you are an alien that has just landed on Earth and this is what you see. On a sheet of paper write down all of the questions that you would want to find out about what you see. Click Me