In the Beta-Minus geography room John learnt that "a savage reservation is a place which, owing to unfavourable climatic or geological conditions, or poverty of natural resources, has not been worth the expense of civilizing."
There are no more uses of "geology" in the book.
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He majored in geology and went on to become expert at finding oil.
Geology has favored the island with rich soil, but also threatens it with volcanic eruptions.