different between geognosis vs geognosy

English

See geognosy.

geognosis (uncountable)

Knowledge of the Earth.
- 1871-72, George Eliot, Middlemarch
  No, he has no bent towards exploration, or the enlargement of our geognosis: that would be a special purpose which I could recognize with some approbation, though without felicitating him on a career which so often ends in premature and violent death. But so far is he from having any desire for a more accurate knowledge of the earth's surface, that he said he should prefer not to know the sources of the Nile, and that there should be some unknown regions preserved as hunting grounds for the poetic imagination.

From German Geognosie; coined by Abraham Gottlob Werner.

geognosy (uncountable)

(obsolete or historical) The geological study of the Earth's structure and composition.

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