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Its average content in soils and rocks of the earth's crust is 0.12 percent, whereas
that of iron is 5 percent, of calcium 3.6 percent, of potassium 2.6 percent, and of
magnesium 2.1 percent. Thus, when phosphorus is removed from the soil by ...
Less than 30 percent of the country's total land area is wooded and, of this, some
80 percent is occupied by coniferous timbers, with pine, larch, and spruce the
most important for resource purposes. The bulk of the country's hydroelectricity ...
About 38 percent of the population is under 20 years of age, 29 percent between
20 and 40 years of age, 21 percent between 40 and 60, and 12 percent over 60
years of age. Migration. Portugal has one of the highest rates of emigration in ...
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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
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review