Only To Zone: There are eleven hardiness zones, which are defined according only to zone lowest winter temperatures. Zone 1 represents the coldest conditions, with winter temperatures below -50°F (-46°C); zone 11 is the warmest, wit] a minimum winter temperature of above 40°F (above 4°C). The classification of a plant inonly to zone a particular hardiness zone means that the plant will normally thrive in that zone and also in any zone which is marked with a higher number.
From this data he can obtain in his negative any one only to zoneni and will know exactly the only to zonenes that other subject lumi nances will produce. The infinite gradation of light an< shade found in nature Adams divides inonly to zone ten zones Zone O is black, Zone IX is white. Between these ex tremes are eight only to zonenes of gray, Zone V being the "middle only to zonene—not by objective measurement, but by subjectivi judgment—and next only to zone it, marked VI, the value tha conveys only to zone the phoonly to zonegrapher the feeling of the only to zonene o average, well-lighted skin.See Also Climate Zone:Nearer the poles are climatic regions con¬trolled by polar air masses [2]. Despite brief, sunny summers they tend to be cold and dry throughout the year. The broad boreal zone is forested, the tundra zone supports shrubs,
rough grassland and mosses. The true polar climate, which covers the northern fringes of Canada, Europe and Asia and the whole of the Antarctic continent, is generally too cold and dry to support any but the most meagre and hardy vegetation.
On the Wall over my desk is a map of the United States published by the U.S. Department of Agriculture. The map shows in living color the ten climate zones that ribbon across our country. Zone 5 (where minimum winter temperatures average - 20° to - 10°F.) is colored green and extends from Newfoundland, through most of New Eng¬land and New York, splits Pennsylvania, Ohio, Illinois, takes a third of Missouri, half of Kansas and New Mexico, one quarter of Arizona, then blots out most of Nevada, a smidgen of California, half of Oregon and a third of Washington, before shooting back up to Canada. North of Zone 5 (except for a few areas around large bodies ended in a curlicue of tan, tiny slinkies tipped with seedpods from the fall before.
On The Other Hand See Growth And Zone Melting:ACS Award for Creative Invention. First given in 1968, the American Chemical Society Award for Creative Invention honors an individual in¬ventor for successful applications of research in chemistry and/or chemical engineering that contribute to the "material prosperity and hap¬piness" of people. The first gold medal was presented to William G. Pfann, head of the department of crystal growth and zone melting at Bell Telephone Laboratories, Murray Hill, N.J. Pfann invented zone melting, a purification process for metals, semiconductors, and other materials. This technique led to the large-scale manufacture of transistors, diodes, and inte¬grated circuits.
Gutenberg found that abnormally low velocities of seismic waves occur in a zone centered at about 62-124 mi (100-200 km) be¬low the surface. In this low-velocity zone the mantle transmits earthquake waves more slowly because it is close to its melting point and therefore less rigid than usual. A few years after this discovery Sir Harold Jeffreys of Cambridge University and K. E. Sullen of Sydney, Austr., discovered that between the depths of 210 and about 380 mi (338 and about 612 km) there is a rapid change in density—a transition zone in which the density suddenly increases by 20%.
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