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Show Climate Change Seen as Earth Recovers From Glacial Period PASADENA. Cal . Msrch 1 (SS) , Even Inose portions of the earth not covered by ice during glacial periods are indirectly Influenced by the Ice sheet One of the rare Instances where these influences could ba detected de-tected waa described by Professor William Morris Davis, visiting proles-tor proles-tor of geology from Harvard university, univer-sity, in s recent sddress her. I The unutusl locality wss the Ssnts Monies mountsina, which rise out of the ocean Immediately west of Los Angeles. There th effect ol three successive glacial periods are visible.! During thesa the sea receded snd the steep cliffs which it wura from the mountains were left to ba aoflened and filled In by land deposits. Meanwhile, Mean-while, the land was rising, ao that' sfler the glacier withdrew the aea could not reach Its old shore line and consequently made new aharp cliffs st s lower level. This process wss repealed re-pealed twice. It is estimsted thst during a glacial period the aea level may sink JO fceet or more. Sine the water removed from the sea forma lea on th continents conti-nents and since thes rover only about one-fifth ol the earth surface, th ic layer must stuun an averag thick- nest of severel hundred feet even if it Is tpresd over half the earth. The present thaet over Greenland is severs! sev-ers! thousand feet thick. It is well known about how fast the Isnd Is ruing In California; so from the difference in level between successive suc-cessive cliffs estimstes csn ba made of the elapned time between glaciers and since tha last ona. It turns out that the latt ona waa quite recent In comparison with the interval between glacial periods. Prufeasor Davis suggested sug-gested thst this msy Indicate that tha earth will get warmer before it tlarti to cool sgsin prior to the nest glacier. The ice raps In tha polar regions msy diasppear entirely and tha poles msy become useful and inhsbited places. Even though the sversgs temperature tempera-ture of the earth need drop only about J degrees below the present aversg to bring on s glscisl period, the consequent con-sequent change in climate msy b enormous. If the earth warms up enough to melt all glaciers now es-itting, es-itting, s remsrksbla chsngs in climate cli-mate all over tha world would probably prob-ably result. The advsntaie to science sci-ence would be incalculable il wa could take observation and mk explorations In comfort in th polai Iregions. . . . I, |