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volcanic rocks
Scope Notes: Before 1978, also search igneous rocks AND volcanic. From 1978-1980, diorite porphyry was a narrower term. From 1981-1985, ash flows was a narrower term.
Broader Terms:
igneous rocks
Narrower Terms:
adakites andesites augitite basalts basanite …
See Also:
ash flows breccia pipes diorite porphyry extrusive rocks granophyre …
Use For Term:
eruptive rocks volcanics
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