The vast arch of cloud above was strangely low, and formed as it were the roof of a large dark cavern, gradually sinking in upon its floor; for the instinctive thought was that the snow lining the heavens and that encrusting the earth would soon unite into one mass without any intervening stratum of air at all.
A heated breeze from the south slowly fanned the summits of lofty objects, and in the sky dashes of buoyant cloud were sailing in a course at right angles to that of another stratum, neither of them in the direction of the breeze below.
There are no more uses of "strata" in the book.
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The candidate reaches across social strata — from millionaires to the unemployed.
Re-orientation of rock strata occurs principally due to tectonic forces.