Question

Obsidian is a good example of
igneous rock.
a) crystalline b) extrusive
c) intrusive
d) primary​

Answer 1

Answer:

(b)EXTRUSIVE

Explanation:

Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock. Obsidian is produced when felsic lava extruded from a volcano cools rapidly with minimal crystal growth.

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Answer 2

Answer:

b extruse

Explanation:

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