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Which would most likely cause molted rock material to became glassy igneous rock?
1.- cooling over a long period of the time
2.- coolng under high pressure
3.- cooling on Earth's surface
4.- cooling at great deapth within the crust
2 Answers
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- Anonymous1 decade agoFavorite Answer
(3) Cooling at the surface and doing it VERY rapidly. That's how you get obsidian.
Source(s): Geologist - Anonymous1 decade ago
3-Cooling on Earth's surface
Glass is formed by extremely rapid cooling of magma, rates that are nearly exclusive to lavas on the surface of the Earth.
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