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These processes probably occurred when the Earth was hotter than it is now; the
resulting lower viscosity would have allowed faster differentiation than could
occur now, but differentiation still may be taking place at a rather slow rate.
Most are soluble in water; the transition metal halides are unstable under
exposure to air. l-Ialite, sodium chloride (NaCl), is the most familiar example; it
often occurs with other evaporite minerals in enormous beds resulting from the ...
Individual variations occur because of the various genetic combinations that
result from random mating of individuals, but non-random, or selective, mating
must occur for natural selection to take place. Certain gene-controlled traits are ...
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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