51. Volcanic glass (obsidian) is a coarsely crystalline b. noncrystalline; like window glass; typically results from very rapid
cooling of a silica rich lava flow c. produced by slow cooling of a lava flow d. produced by escaping gases in a magma
1 answer:
Answer:
b. noncrystalline
Explanation:
Volcanic glass -
It is a noncrystalline or amorphous substance , which is formed via rapid cooling of the magma . It is matrix or interstitial .
Volcanic rock is also called as the vitreous igneous rocks .
Most commonly called the obsidian , it is a high silica content , rhyotic glass .
Some example of volcanic glass are , Apache tears , Pumice etc .
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