Universal-facts - Ocean geography, Total sea water on earth

Ocean geography



There are 328,000,000 cubic miles of sea water on earth, covering approximately 71 percent of earth's surface.

By volume, the ocean makes up 99 percent of the planet's living space- the largest space in our universe known to be inhabited by living organisms.

About 97 percent of all water on earth is in our oceans, 2 percent is frozen in our ice caps and glaciers, less than 0.3 percent is carried in the atmosphere in the form of clouds, rain, and snow. All of our inland seas, lakes and channels combined add up to only 0.02 percent of earth's water.

The Antarctic Ice Sheet is almost twice the size of the United States.

Earth's ocean is made up of more than 20 seas and four oceans: Atlantic, Indian, Arctic, and Pacific, the oldest and the largest.

The ocean accounts for 0.022 percent of the total weight of earth, weighing an estimated 1,450,000,000,000,000,000 short tons (1 short ton = 2,000lbs).



At the deepest point in the ocean the pressure is more than 8 tons per square inch, or the equivalent of one person trying to hold-up 50 jumbo jets against the force of gravity.

The major ions in seawater are Na+, Mg2+, Ca2+, K+, Sr2+, Cl-, SO42- (sulfate), HCO3- (bicarbonate), Br-, B(OH)3 (boric acid), and F-. Together, they account for almost all of the salt in seawater.

At 39 degrees Fahrenheit (3.89 degrees Celsius), the temperature of almost all of the deep ocean is only a few degrees above freezing.

If extracted, it is estimated that all the gold suspended in the world's seawater would give each person on Earth 9 pounds.

If the ocean's total salt content were dried, it would cover the continents to a depth of 500 feet.

When nitrogen and phosphorus from sources such as fertilizer, sewage and detergents enter coastal waters, oxygen depletion occurs. One gram of nitrogen can cause enough organic growth to require 15 grams of oxygen to decompose the resulting vegetation. A single gram of phosphorus will deplete about one hundred grams of oxygen.

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