Word: kennett
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Dates: during 1970-1979
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...Knight of Kennett Square...
...after studying cylindrical-core samples of ocean sediment dug up by the deep-sea drilling ship Glomar Challenger, two University of Rhode Island researchers have found evidence that may help provide the answer. The telltale position of layers of volcanic ash found in the cores by Geologists James Kennett and Robert Thunell suggests that the first great ice age could have been set off by a worldwide series of volcanic eruptions...
...seems clear that the layers of ash in the Glomar Challenger's cores are the residue of more than one volcanic eruption. Kennett and Thunell point out that the ash is so widely distributed, ranging from the arcs of volcanic islands in the Pacific to volcanically active regions in Central America and the mid-Atlantic, that it can best be explained by a sharp and worldwide increase in volcanic activity...
...process in which the great plates that form the earth's surface bump, jostle and sometimes slide underneath each other, carrying the continents along with them. This activity often arouses the earth's volcanoes, most of which lie near plate boundaries. The core evidence discovered by Kennett and Thunell has given further weight to a viewpoint shared by an increasing number of scientists: that all major changes occurring in or above the earth-including variations in climate-are closely interrelated and must always be considered as part of a chain of global events...