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Sandstone 19. Obsidian is a type of volcanic glass that is formed when lava cools. Obsidian is a/an a. intrusive igneous rock c. sedimentary rock b. extrusive igneous rock d. metamorphic rock
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Sandstone

19. Obsidian is a type of volcanic glass that is formed when lava cools. Obsidian is
a/an
a. intrusive igneous rock
c. sedimentary rock
b. extrusive igneous rock
d. metamorphic rock

User Costamatrix
by
7.7k points

1 Answer

2 votes

Answer: b

Explanation: Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock

User Rida BENHAMMANE
by
6.9k points
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