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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asked Apr 20, 2021 211k views

2 votes

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

Geography
college

Costamatrix asked

by Costamatrix

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Answer: b

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

Rida BENHAMMANE answered Apr 26, 2021

by Rida BENHAMMANE

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