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To: Maurice Winn who wrote (51449)	7/8/2004 5:54:18 AM
From: elmatador	Respond to of 74559

The composition of the sea salt is not going to chnage tomorrow morning: It has been about the same for about 1 billion years. That is because a balance exists between input of salts (mainly from rivers) and output (mainly into sediments). The early ocean, 3.8 billion years ago, was probably similar in composition to today, except for changes caused by living things. The most important of these is the production of oxygen by cyanobacteria and plants. Also, marine organisms have caused large amounts of carbon to accumulate in ocean sediments, decreasing the carbon dioxide content of the atmosphere and ocean.