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116 CAUSES OF RAIN. |
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" Yes," said his papa, " the atmosphere becomes less dense as it is more distant from the earth; so that the vapour, which the sun causes to exhale, rises until it reaches a region of its own weight ; here it remains stationary for a time, till the accumulation of fresh vapours forms clouds, and these at length becoming too heavy for the air to support, descend in copious showers of rain, to refresh and fertilize the earth."
Lewis thought he could quite understand this. " But is this wonderful process," he asked, " always going on ? for, if so much rain and moisture falls upon the earth and sinks into it, does it not injure it? I should think the sun and wind would only dry the surface." |
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