The book An Introduction to Physical Geography was written by author Grove Karl Gilbert Here you can read free online of An Introduction to Physical Geography book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to Physical Geography a good or bad book?
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It is most noticeable in autumn and spring upon roofs, fences, and fields. Clouds often prevent frost by holding in the heat which has accumulated during the day, and we some- times imitate nature by covering plants on clear nights to protect them from frost. 201. Clouds and fog. — Fog is a cloud in the lower air. If the dew-point is reached at the earth's surface, moisture gathers there. If a few feet or a few hundred feet of the lower air cool to the dew-point, fog is formed. The par- ticles ...of invisible vapor unite and become visible, but are still so small that the air supports them. Thus it is that a thin layer of mist may spread over a swamp or valley bot- tom, so that from a hilltop we can look out over a lake of fog. In the rays of the sun the air grows warmer, and when the relative humidity falls below 100 per cent the fog evaporates. The particles of vapor separate more readily from the air when they can at the same time attach themselves to particles of dust. It is also true that the floating dust cools faster than the air about it, just as the ground cools faster than the neighboring air.
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