Oceans of the World

By: Lindsay and Rebecca

Ocean Zones

• Sunlit Zone: Top layer, nearest the surface. Enough light to support photosynthesis.

• Twilight Zone: Small amount of light penetrates the water. Water becomes deeper, and pressure increase, too. Plants do not grow here. Only animals that have adapted to little light survive.

• Midnight Zone: 90% of the ocean is in the midnight zone. Entirely dark. Water pressure is extreme. Temperature is near freezing.

• Special forms of bacteria use hydrogen sulfide to make food. All other living things in this zone eat the bacteria.

Atlantic Ocean• Area= 82 million square km• Average depth= 11,812 ft• Greatest depth= 28,231 ft• Endangered species:– Manatee– Seals– Sea lions– Turtles– Whales

Arctic Ocean• Area= 12 million square km • Average depth: 3,450 ft• Fragile ecosystem slow to change and slow to recover from disruptions or damage. • Endangered species:– Whales– Walruses

Indian Ocean• Area= 73 million square km• Average depth= 12,762 ft• Greatest depth= 25,344 ft• Endangered species:– dugong – Seals– turtles– whales

Pacific Ocean• Area= 166 million square km• Average depth= 14,000 ft• Greatest depth= 35,797 ft• Endangered species:– Dugong– sea lion– sea otter– seals– turtles– whales