Seawater: Helpful or Hurtful?
If you are stranded in the middle of the ocean with no water, it may seem logical to drink the water all around you. But this is not a good idea because the water has salt in it which can cause your organs to fail due to the excess salt and you could die of dehydration.
Why is the ocean important to life on Earth?
There are many reasons the ocean is important. It has 97% of the Earth's water, and covers 3/4 of the Earth. Another reason is that it produces more than half of the oxygen in the atmosphere.
Ocean currents affecting climate on Earth
Layers of the ocean
There are five layers of the ocean. From the surface to about 650 feet, is the sunlight zone. It has enough sunlight to support photosynthesis. The twilight zone goes to about 3,300 feet. The temperature ranges from 68 to 39 degrees fahrenheit. Next is the midnight zone. It goes down to 13,000 feet. The only visible light here is produced by the animals themselves. After that there is the abyssal zone. It reaches as far as 19,000 feet. The water temperature is near freezing and there is no light. The last zone is called the trenches. It goes down all the way to 30,000 feet. There is immense pressure and the temperatures are even lower, but life can still be found.
Pressure, temperature, and ocean depth
The deeper and deeper you go into the ocean, the more harm you can cause to yourself. Without special equipment, a human could not survive the low temperatures and high pressure.
Resources from the ocean
There are many resources we can get from the ocean. Some of them are salt, iron, nickel, and copper. We can also drill to get crude oil.