Meaning Of The Word Volcanic glass

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Volcanic glass Meaning

Volcanic glass Definition
Volcanic glass Definition

What's The Definition Of Volcanic glass?

volcanic glass in American English
a natural glass produced when molten lava cools very rapidly; obsidian
natural glass, as obsidian, formed by the very rapid cooling of molten lava

volcanic glass in British English
noun: any of several glassy volcanic igneous rocks, such as obsidian and pitchstone

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