Oceanography: physical, chemical and geological study of oceans.
Marine Biology: scientific study of all living organisms in the ocean.
Water covers 70.8% of the Earth and the average depth is 4000m.
4 Major Oceans:
1. Pacific: Deepest and largestwith most diverse life
2. Atlantic: relativelynarrow and connects Arctic and Antarctic; receives its water from rivers
3. Indian: Smallest of 3 oceans
4. Arctic: three major ocean basins connect to the southern.
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