A New Physical Geography Volume 2

A New Physical Geography Volume 2

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 edition. Excerpt: ...rain which evaporates. Among the causes which determine a greater precipitation of moisture on the mountains than on the plains below, we must also reckon the difference of temperature usually existing between the summits and the surrounding atmosphere. During the day the slopes exposed to the warmth of the sun are more heated than the surrounding air--at least in calm weather; but the ravines often remain much colder, and consequently the contact causes rain to fall by suddenly chilling the atmospheric strata. During the night, and at all times when the wind blows violently, the salient angles of the mountains become in their turn much colder than the sheltered gorges, and it is they that condense the mists of the air and cause the rain. How many times in mountainous countries, when the sky is perfectly clear and blue, do we not see the high peaks enveloped in a mist like the smoke of volcanoes! These clouds which we perceive around the summits are found in warm air in the state of invisible vapours; it is the cold contact of the rocks or snows which has suddenly revealed them. The mountain peak thus announces to the inhabitants of the valleys that the atmosphere is saturated with vapours, and warns them of an approaching change in the temperature. The mountains thus constantly serve as meteorological indicators to the neighbouring population, and in each mass of heights they always look towards one of the largest peaks, to see if it has "put on its cap" of clouds. Direct observations collected in various parts of the world have demonstrated that, all other things being equal, the annual precipitation of rain-water is in proportion to the altitude of the country--at least to a certain height in the mountains. According to Keith...
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Product details

  • Paperback | 232 pages
  • 189 x 246 x 12mm | 422g
  • United States
  • English
  • black & white illustrations
  • 1236492803
  • 9781236492807