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The retreat of ice sheets produced basins through mechanical action and through
the damming effect of their ice masses at their boundaries ( see further
GLACIATION , LANDFORMS PRODUCED BY ) . In some cases , lakes actually
exist in ...
In the present oxygen atmo - sphere , largely produced by green - plant
photosynthesis , such molecules would tend , over geological time , to be
oxidized to carbon dioxide , nitrogen , and water . In addi - tion , as Darwin
recognized , the first ...
William Hutchinson of Liverpool in 1777 produced the first practical mirrors for
lighthouses , consisting of a large number of small facets of silvered glass , set in
a plaster cast molded to a parabolic form . More generally , shaped metal
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review