Geography, 24.11.2020 22:10 angelvega2003

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