By Peter Aleshire
ISBN-10: 0816059195
ISBN-13: 9780816059195
Ocean Ridges and ditchs immerses readers within the mysteries of the world's sea flooring, from the dazzling creatures of the Galapagos Rift to the devastating tsunamis of the Java Trench. This new quantity in ''The severe Earth'' set finds how 10 undersea mountain levels and valleys got here to be, how and why it has replaced over the span of geologic time, and its contributions to the surroundings. The ridges and ditchs coated span the Mariana Trench, the inner most element within the ocean, and the San Andreas Fault, website of a lot of California's earthquakes. each one bankruptcy offers illuminating fabric on environmental demanding situations and specialist studies on technological know-how in motion, with info on box reviews carried out at every one sea-floor web site. extra articles disguise comparable high-interest subject matters, akin to substantial squids, magnetic fields, and plate tectonics. This e-book is supported with pictures and line illustrations, a thesaurus of clinical phrases, and recommendations for locating additional info.
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Example text
They hoped that scientists could build very sensitive detectors that could sense the magnetic field created by a metal submarine hidden beneath the surface. The navy also wanted to find ways to prevent mines triggered by magnets from going off whenever they came near the metal hull of a ship. They knew that undersea mountains and masses of magnetic rock create tiny changes in the magnetic field of the Earth—little bumps of magnetic force that when graphed stand out like a sock under a bedspread.
In the 1950s, another scientist, Jan Hospers, made the same discovery by studying volcanic rocks in the strange island of Iceland, which fumes, sputters, and rattles with constant volcanic activity. That island rises implausibly from the sea right at the northern end of the great chain of mountains known as the Mid-Atlantic Ridge, which sonar maps had revealed during World War II. Mysterious Magnetic Stripes The fresh evidence that the Earth’s poles seemed to sometimes flip inspired scientists to look at other volcanic rocks.
In addition, Piccard rigged the two enormous batteries that drove the electrical equipment and the lights on the submersible to drop off the hull if the electricity ever went off. That would instantly lighten the Trieste by 2,500 pounds (1,134 kg), so that even in a dire emergency it would float to the surface rather than sink to the bottom. However, Piccard soon found himself in a race with the French, who had modified and improved his original submersible. Both teams were racing to reach the deepest place in the ocean.
Ocean Ridges and Trenches by Peter Aleshire
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