Word: biogeochemist
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That is crucial, observes David Des Marais, a NASA biogeochemist. Liquid water is an ideal medium in which carbon-based organic chemicals can dissolve and react with one another in myriad ways. Why carbon, necessarily? Because, says Des Marais, "it is such a versatile chemical. It makes so many different and complex compounds. And it's the fourth most abundant element in the universe." Carbon compounds literally litter the cosmos, drifting through interstellar space in giant molecular clouds and making up a significant percentage, by mass, of comets and asteroids. Some scientists are convinced that the basic building blocks...
Buried toxins can also be moved around by shrimp and other creatures that dig into the bottom and spread the substances through digestion and excretion. Though ocean sediment generally accumulates at a rate of about one-half inch - per thousand years, Biogeochemist John Farrington of the University of Massachusetts at Boston cites discoveries of plutonium from thermonuclear test blasts in the 1950s and 1960s located 12 in. to 20 in. deep in ocean sediment. Thus contaminants can conceivably lie undisturbed in the oceans indefinitely -- or resurface at any time...
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