The document describes the three zones of the ocean: the sunlight zone from the surface down to 600 feet where 90% of marine life lives due to sufficient light for photosynthesis; the twilight zone from 600 to 3,000 feet with some light penetration where organisms have adapted to low light conditions; and the midnight zone below 3,000 feet that is entirely dark, near freezing temperatures, and home to bacteria that use minerals from cracks in the earth's crust as an energy source to nourish other living things in the zone.

1. The World’s Oceans And who lives there…

2. The Ocean Divided into three zones: Sunlight Twilight Midnight Can you guess which one is the darkest?

3. The Sunlight Zone

4. SUNLIGHT ZONE Top layer, nearest the surface Also called euphotic zone Enough light penetrating the water for photosynthesis More than 90% of all marine life lives here

5. SUNLIGHT ZONE Goes down about 600 ft. Most fish live in this zone (Stingrays, seals, jellyfish, turtles) Plankton live here. Plankton are drifters…they can’t swim. Usually microscopic Beginning of the food chain

6. PLANKTON Examples are: Jellyfish Young crabs Microscopic plants Microscopic animals

7. The Twilight Zone

8. TWILIGHT ZONE Small amount of light can penetrate water No plants Only those that have adapted to little light Also known as disphotic zone.

9. TWILIGHT ZONE Between 600 – 3,000 feet below the surface Some squid and fish can use their bodies to make light Bioluminescence They Glow !

10. TWILIGHT ZONE Some twilight zone dwellers (like lantern fish) will swim into the sunlight zone at night to find food .

11. The Midnight Zone

12. MIDNIGHT ZONE 90% of the ocean Entirely dark—no light Temperature is near freezing Also called aphotic zone

13. MIDNIGHT ZONE What lives here? Some are close to cracks in the Earth's crust Cracks give off mineral-rich materials Bacteria uses minerals from the cracks for energy All other living things in the midnight zone are nourished by these bacteria .

14. Let’s Tour The Deep Click “ Worlds Within the Sea ” Click “ Deep See Vents ”