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There is a fine reddish-yellow sand in the lower air-strata; we see it, we feel it, and we know that it comes from the desert-tracts of northern Africa. The air rises en masse from the Great Sahara; the vacuum is speedily filled by the heavier and cooler indraught from the north or south, and the higher strata form the upper current flowing from the Equator to the Poles.
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