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Word Count: 1,582
The oceans are said to be the source of life The enormous blue calm oceans are the signatures of the planet earth They cover nearly three-fourths of the surface of the earth This is equal to 71 percent of the earths entire surface or about 361 million sq km 140 million sq mi Its average depth is 5000 m 16000 ft and its total volume is about 1347000000 cu km 322300000 cu mi This includes the Atlantic Pacific and Indian oceans These oceans are bordered by the continental masses or by ocean ridges or currents The ocean basins hold at immense amount of over 285 million cubic miles of water 1185 million cu km This quantity of water developed from the Earths interior as it cooled In order to understand the role water plays in our lives you must know the chemistry of water itself Each molecule of water is composed of two hydrogen atoms and one oxygen atom The hydrogen atoms bond to the oxygen atom unevenly by sharing electrons This is shown in figure 1-1 Important interactions take place because of the electron sharing The oxygen atom tends to draw the electrons provided by the Hydrogen atoms closer to its nucleus making an electrical separation and a polar molecule The polar nature results in the hydrogen end which has a positive charge attracting the oxygen end with a negative charge of other nearby water molecules This forms hydrogen bonds between other water molecules These bonds are weak compared to the electron sharing bonds 6 as strong and are easily broken and changed This is shown in figure 1-2 There are many different properties of the ocean water Seawater is fresh water and dissolved solids in gases due to erosion and weathering of landmasses In figure 1-3 it shows the electromagnetic spectrum and the transmission of light into fresh or salt water Objects such as rocks are being dissolved by rainwater and
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