GEOLOGY

Detailed explanation-1: -Cold water has a higher density than warm water. Water gets colder with depth because cold, salty ocean water sinks to the bottom of the ocean basins below the less dense warmer water near the surface.

Detailed explanation-2: -Therefore, the deep ocean (below about 200 meters depth) is cold, with an average temperature of only 4°C (39°F). Cold water is also more dense, and as a result heavier, than warm water. Colder water sinks below the warm water at the surface, which contributes to the coldness of the deep ocean.

Detailed explanation-3: -The deeper you go under the sea, the greater the pressure of the water pushing down on you. For every 33 feet (10.06 meters) you go down, the pressure increases by one atmosphere .

Detailed explanation-4: -Temperatures of 120 degrees Celsius (248 degrees Fahrenheit) are normally encountered at about 4, 000 meters below the seafloor. There is only one way for scientists to obtain samples from such great depths–with the deep-sea scientific drilling vessel Chikyu.

Detailed explanation-5: -According to new research, deep in the Pacific one region is actually getting colder. This decreasing temperature in the ocean depths is also caused by climate change, but not the modern kind we’re so familiar with. Instead, this cooling is caused by a minor ice age that happened hundreds of years ago.