What condition results in magma cooling and forming a “glassy” igneous rock? a. extremely slow cooling b. cooling in the presence of oxygen c. extremely rapid cooling d. partial melt cooling

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What condition results in magma cooling and forming a “glassy” igneous rock?

a.
extremely slow cooling
b.
cooling in the presence of oxygen
c.
extremely rapid cooling
d.
partial melt cooling

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c. extremely fast cooling

The igneous rock develops with the appearance of glass because the magma forms these very viscous rocks by the sudden cooling of this viscous material resulting in volatile loss. The material when cooled arrives in the form of a glass – like rock and no crystallization occurs.