Was that, too, destined to thrive awhile and decay and vanish, and be replaced by another, Nortekku wondered? Probably. The earth changes, he thought. Mountains rise, are ground to dust, give way to plains and valleys. Shorelines are drowned; new islands are thrust upward out of the sea. Civilizations are born, die, are forgotten. The planet alone abides, and all that dwells upon it is transient. Contemplating these things, he felt much the richer for all his freshly acquired knowledge. He felt that for the first time he comprehended, at least some small way, the great chain of existence, stretching across time from misty past to unborn future.