Such is indeed also the case with the soil of your planet, but the globules are brittle and so do not yield to a blow or fall, but rather compress further. And, if lying undisturbed alongside one another for many consecutive years, they grip together so stubbornly as to turn to stone, then offering still more stubborn resistance in the natural state than they did in their separate units, for which reason a planet's vegetation must needs be more meager than upon the perfect sun-planet. – The Natural Sun, Chapter 1, Paragraph 7
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