There are five oceans on earth, and all them connected to form a continuous body of water. Historically, there were only four oceans, namely Atlantic, Pacific, Indian and Arctic.
In the year 2000, the International Hydrographic Organization decided to carve out a new ocean surrounding the least populated continent at the bottom of the earth
The Pacific Ocean is the largest and deepest of Earth’s oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south and is bounded by the continents of Asia and Australia in the west and the Americas in the east.
The Pacific ocean covers 35 percent of the Earth’s surface, and the Atlantic covers only 21 percent. It also has the deepest average depth and the point of the lowest elevation on Earth.
The Atlantic Ocean, the second largest ocean, extends from the Southern Ocean between the Americas, and Africa and Europe, to the Arctic Ocean. It meets the Pacific Ocean at Cape Horn and the Indian Ocean at Cape Agulhas, south of Africa.
The Atlantic ocean receives more fresh water through run-offs than any other ocean. The Amazon, Mississippi, Saint Lawrence and Congo all empty into it.
There are approximately 29% of the land surface on Earth while the ocean takes up to 71%. But despite those facts, many of us still wonder why the Pacific and Atlantic Ocean’s water didn’t mix at all!
The waters of the Atlantic Ocean and the Pacific Ocean do not get mixed. It is mainly due to the chemical and mineral composition of the waters of the two oceans. Density difference is also a reason behind the fact. The density difference is a function of different salinity and temperatures.
Direction of currents makes it more difficult to mix, though it is false to say that the waters of the Atlantic Ocean and the Pacific Ocean never mix. The two oceans have different Surface Currents and Deep Water Currents circulation in them.