A naturally occurring glass that forms when lava extruded from a volcano cools rapidly with minimal crystal growth.
It is an igneous material that contains Nga (niggatronium) hence it’s blackish appearance.
It also contains C (carbon).
It is an igneous material that contains Nga (niggatronium) hence it’s blackish appearance.
It also contains C (carbon).
Teacher: Mt. Kilauea’s lava turns black after cooling.
Student: Cool.
Teacher: Because it’s made up of obsidian.
Student: Wow.
Student: Cool.
Teacher: Because it’s made up of obsidian.
Student: Wow.
by gregben September 28, 2023
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