Word: crustal
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Dates: during 1980-1989
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What is more, the restless tectonic plates spawn volcanic eruptions, which spew carbon dioxide into the air. The increase in atmospheric carbon dioxide results in a greenhouse effect, which traps the sun's energy, causing temperatures on land and in the sea to rise markedly. Conversely, crustal movement may allow frigid ocean currents from the poles to invade tropical waters, leading to a worldwide drop in temperatures. Those species that cannot adapt to the earth's erratic behavior simply succumb. To many paleontologists, as well as geologists, it seemed to make sense...
...earth in volume but has a mass only 14 1/2 times as great, has a liquid core. Some scientists speculate, however, that the magnetic field may be generated by an electrically charged ocean covering the planet. Some of the larger moons apparently have, or at one time had, crustal movements that created the fault zones and valleys evident in the Voyager photographs. Geologist Laurence Soderblom, for one, was surprised at what he called "the degree of geological activity on the Uranian satellites." Along some of the faults on Titania, he said, "some sort of material is leaking out of fractures...