PLUTONISM

Etymology

Noun

plutonism (countable and uncountable, plural plutonisms)

The old geological theory that the rocks forming the Earth were formed in fire by volcanic activity, with a continuing gradual process of weathering and erosion, then deposited on the sea bed, re-formed into layers of sedimentary rock by heat and pressure, and raised again.

Synonyms

• vulcanism

Source: Wiktionary

Plu"to*nism, n. Etym: [Cf. F. plutonisme.]

Definition: The theory, early advanced in geology, that the successive rocks of the earth''s crust were formed by igneous fusion; -- opposed to the Neptunian theory.

Source: Webster’s Unabridged Dictionary 1913 Edition

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