Introduce the Ocean Zones

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Introduce the Ocean Zones

  1. 1. The World’s Oceans And who lives there…
  2. 2. The Ocean <ul><li>Divided into three zones: </li></ul><ul><li>Sunlight </li></ul><ul><li>Twilight </li></ul><ul><li>Midnight </li></ul><ul><li>Can you guess which one is the darkest? </li></ul>
  3. 3. The Sunlight Zone
  4. 4. SUNLIGHT ZONE <ul><li>Top layer, nearest the surface </li></ul><ul><li>Also called euphotic zone </li></ul><ul><li>Enough light penetrating the water for photosynthesis </li></ul><ul><li>More than 90% of all marine life </li></ul><ul><li>lives here </li></ul>
  5. 5. SUNLIGHT ZONE <ul><li>Goes down about 600 ft. </li></ul><ul><li>Most fish live in this zone </li></ul><ul><ul><li>(Stingrays, seals, jellyfish, turtles) </li></ul></ul><ul><li>Plankton live here. </li></ul><ul><ul><li>Plankton are drifters…they can’t swim. </li></ul></ul><ul><ul><li>Usually microscopic </li></ul></ul><ul><ul><li>Beginning of the food chain  </li></ul></ul>
  6. 6. PLANKTON <ul><li>Examples are: </li></ul><ul><li>Jellyfish </li></ul><ul><li>Young crabs </li></ul><ul><li>Microscopic plants </li></ul><ul><li>Microscopic animals </li></ul>
  7. 7. The Twilight Zone
  8. 8. TWILIGHT ZONE <ul><li>Small amount of light can penetrate water </li></ul><ul><li>No plants </li></ul><ul><li>Only those that have adapted </li></ul><ul><li>to little light  </li></ul><ul><li>Also known as disphotic zone. </li></ul>
  9. 9. TWILIGHT ZONE <ul><li>Between 600 – 3,000 feet below the surface </li></ul><ul><li>Some squid and fish can use their bodies to make light </li></ul><ul><li>Bioluminescence </li></ul><ul><li>They Glow ! </li></ul>
  10. 10. TWILIGHT ZONE <ul><li>Some twilight zone dwellers </li></ul><ul><li>(like lantern fish) </li></ul><ul><li>will swim into the sunlight zone </li></ul><ul><li>at night to find food . </li></ul>
  11. 11. The Midnight Zone
  12. 12. MIDNIGHT ZONE <ul><li>90% of the ocean </li></ul><ul><li>Entirely dark—no light </li></ul><ul><li>Temperature is near freezing </li></ul><ul><li>Also called aphotic zone </li></ul>
  13. 13. MIDNIGHT ZONE <ul><li>What lives here? </li></ul><ul><li>Some are close to cracks in the Earth's crust </li></ul><ul><li>Cracks give off mineral-rich materials </li></ul><ul><li>Bacteria uses minerals from the cracks for energy </li></ul><ul><li>All other living things in the </li></ul><ul><li>midnight zone are nourished </li></ul><ul><li>by these bacteria . </li></ul>
  14. 14. Let’s Tour The Deep <ul><li>Click “ Worlds Within the Sea ” </li></ul><ul><li>Click “ Deep See Vents ” </li></ul>

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