1. The Ocean and its Zones

2. Oceans There are 5 Pacific is the biggest
We get many resources from them:
Food
Minerals
Fuel (oil)
Freshwater (through evaporation)

3. contain water and salts
The main salt is Sodium Chloride

4. The ocean is 35 parts per thousand or 3.5% salt.
Salinity is a measurement of the total amount of dissolve salts in water.
The ocean is 35 parts per thousand or 3.5% salt.

5. The ocean is divided into zones horizontally (like layers of a cake) and vertically.

6. These are the horizontal zones

8. As you go from the surface to the transition and into the deep zone:
Surface  ft
As you go from the surface to the transition and into the deep zone:
Light decreases
Temperature decreases
Pressure increases
Oxygen and nutrients levels fluctuate but are lowest in the transition zone
Transition 600 – 2600ft
Deep  2600ft- sea floor

9. Surface, Sunlit, Photic Zone
On top (0 to 200m or 0 – 600 ft.)
Gets sunlight
Warmest layer but temps. drop quickly
Plenty of food and plankton growth
Lots of oxygen and gases

10. Pressure is increasing
Color and light fades quickly in the order of the rainbow. By 60 ft. there are only blacks, browns, grays, and whites. The deeper you dive the more water is over the top of you.
Pressure is increasing
Contains familiar plants and animals.
Once you get down to about a depth of 100 feet you will feel the pressure against every square inch of your body. It really becomes noticeable as you breathe. At a depth of 100 feet, the size and volume of your lungs has been reduced to 1/3rd their capacity at sea level. You will also notice that it is much darker at 100 feet and COLD. The lack of sunlight at that depth also means the ocean is not getting warmed by sunlight, either. At a depth of about 180 feet you’ve pretty much reached the
limit of safe diving for a human
breathing compressed air.

11. Transition, Thermocline, or Twilight Zone
200m- 1 km down
Rapid temperature drop to 4OC
less food and plankton b/c less light
Little oxygen
more pressure (over 100 atms at the bottom)
lowest in nutrients
Few things live here

12. Deep, Midnight, bathypelagic Zone
1km to ocean floor
Deepest
Darkest (absolutely no light not even, a realm of perpetual darkness, where even the faintest blue tendrils of sunlight cannot penetrate)
tremendous pressure
near freezing temperatures
Little food (most falls from the surface zone)
Most dense water

13. Life that in the midnight zone is very difficult
Life that in the midnight zone is very difficult. It relies indirectly on the benefits of sunlight; organisms thriving in the sunny upper layers of the sea die their eventual deaths and rain down upon the sea floor a steady flow of organic nutrients to feed the masses living at or near the bottom. The organic “rainfall” includes dead microscopic organisms, such as phytoplankton and dinoflagellates, sinking downward, fecal pellets of fish and mammals, and carcasses of larger organisms sinking down to the sea bed. Those creatures that do not feed directly on the “leftovers” raining down from above, usually prey upon those that do. Many of the creatures thriving in the deep sea have taken on fascinating, gruesome and horrifying visages and proportions, developing special adaptations to surviving in this harsh environment

14. Vertical zones include the open ocean, the neritic, & intertidal zones

15. The ocean and its zones are constantly in motion and are impacted by:
plate tectonics,
weather,
climate,
river systems, and
human activities.