Word: planet
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Dates: during 1990-1999
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...rewards could be enormous: oil and mineral wealth to rival Alaska's North Slope and California's Gold Rush; scientific discoveries that could change our view of how the planet--and the life-forms on it--evolved; natural substances that could yield new medicines and whole new classes of industrial chemicals. Beyond those practical benefits there is the intangible but real satisfaction that comes from exploring earth's last great frontier...
There's a lot to explore. Oceans cover nearly three-quarters of the planet's surface--336 million cu. mi. of water that reaches an average depth of 2.3 miles. The sea's intricate food webs support more life by weight and a greater diversity of animals than any other ecosystem, from sulfur-eating bacteria clustered around deep-sea vents to fish that light up like New York City's Times Square billboards to lure their prey. Somewhere below there even lurks the last certified sea monster left from pre-scientific times: the 64-ft.-long giant squid...
...flat, featureless plain, the sea floor is rent and wrinkled with a topography that puts dry land to shame. Not only do the seas hold canyons deep enough to hide the Himalayas, but they are also the setting for what is by far the largest geologic feature on the planet: a single, globe-circling 31,000-mile-long mountain range that snakes its way continuously through the Atlantic, Pacific, Indian and Arctic oceans...
...that lead to phenomena like the Pacific's El Nino can not only devastate populations of commercially valuable fish but also trigger dramatic shifts in weather patterns. Oceanic fluctuations over much longer time scales, combined with major currents like the Gulf Stream, may start (and bring to an end) planet-wide climatic changes like the Ice Ages...
While academics think of the vents as fascinating natural chemistry labs, capitalists view them as mini-refineries, bringing valuable metals up from the planet's interior and concentrating them in convenient locations. Oceanographers have long known that parts of the Pacific sea floor at depths between 14,000 ft. and 17,000 ft. are carpeted with so-called manganese nodules, potato-size chunks of manganese mixed with iron, nickel, cobalt and other useful metals. In the 1970s, Howard Hughes used the search for nodules as a cover for building the ship Glomar Explorer, which was used to salvage a sunken...