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Rods occur whenever the volume fraction of one of the phases is small . Many complex and irregular eutectic ... When nucleation occurs in the absence of a surface — i.e . , in the bulk of a liquid — it is said to be homogeneous .
In contrast , endemic ( enphytotic ) diseases occur to some extent in the same area each year and generally cause little concern . Epiphytotics affect a high percentage of the host plant population , sometimes over a wide area .
Representing the end - products of weathering ( q.v. ) , denudation , and soil formation , they occur mainly on erosional platforms such as pediments ( q.v. ) or as cappings and residuals on stream divides .
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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