The Unexplored Oceans
Much of the Ocean Bottom Remains Unexplored and Unmapped

The Unexplored Oceans
Much of the Ocean Bottom Remains Unexplored and Unmapped

The ocean is a major body of saline water, and a principal component of the hydrosphere.

Approximately 71% of the Earth's surface is covered by ocean, a continuous body of water that is customarily divided into several principal oceans and smaller seas.

More than half of this area is over 3,000 metres (9,800 ft) deep. Scientists estimate that 230,000 marine life forms of all types are currently known, but the total could be up to 10 times that number.

To date, we have explored less than five percent of the ocean.

The ocean has a significant effect on the biosphere. Oceanic evaporation, as a phase of the water cycle, is the source of most rainfall, and ocean temperatures determine climate and wind patterns that affect life on land.

Life within the ocean evolved 3 billion years prior to life on land which began only 400 million years ago. Both the depth and distance from shore strongly influence the amount and kinds of plants and animals that live there.

There are hundreds, if not thousands of unknown creatures living in the depths of our very oceans. Some species have never been discovered, while other species that were thought to be extinct are actually still living.

Ocean travel by boat dates back to prehistoric times, but only in modern times has extensive underwater travel become possible.

The deepest point in the ocean is the Mariana Trench, located in the Pacific Ocean near the Northern Mariana Islands. Its maximum depth has been estimated to be 10,971 metres (35,994 ft).

The British naval vessel, Challenger II surveyed the trench in 1951 and named the deepest part of the trench, the "Challenger Deep".

In 1960, the Trieste successfully reached the bottom of the trench, manned by a crew of two men. Much of the ocean bottom remains unexplored and unmapped.

A global image of many underwater features larger than 10 kilometres (6.2 miles) was created in 1995 based on gravitational distortions of the nearby sea surface.

Geologically, an ocean is an area of oceanic crust covered by water. Oceanic crust is the thin layer of solidified volcanic basalt that covers the Earth's mantle.

Continental crust is thicker but less dense. From this perspective, the earth has three oceans: the World Ocean, the Caspian Sea, and Black Sea.
The ocean is a continuous body of salt water that covers approximately 71 percent of the Earth's surface. The average salinity of ocean water is approximately three percent.

The oceans provide 99 percent of the Earth's living space, the largest space in our universe known to be inhabited by living organisms.

The deepest known area of the ocean, at 11,034 m (36,192 ft) is the Mariana Trench, located in the western Pacific Ocean.

There are many mysteries within the deep oceans on Earth. Much of the oceans to this day remain unexplored. To this date we have explored less than five percent of the ocean.

Scientists from around the world have speculated that there may actually be more than 750,000 species that have yet to be discovered under the oceans.

It is sometimes said that we know much more about our moon than our very own oceans.