2. Major Bodies of Water Four oceans: Pacific, Atlantic, Indian, and Arctic Pacific is largest and deepest 64,186,300 square miles 12,925 feet average depth Fifth ocean delimited in 2000 Southern Ocean north of Antarctica
3. Coral Reefs Form in shallow, warm seas Made of coral polyps’ skeletons Grow on top of old skeletons Spend adult lives fixed to same spot Coral diseases increasing dramatically past 10 years Responding to onset of bacteria, fungi, viruses
4. Ocean Zones Sunlit (down to 650 feet) Sea plants and many animals Twilight (down to 3,300 feet) Many different fish Sunless (down to 13,100 feet) Animals feed on dead food from above
