Answer
Obsidian rock.
Work Step by Step
same as above.
Earth: An Introduction to Physical Geology (12th Edition)
by Tarbuck, Edward J.; Lutgens, Frederick K.; Tasa, Dennis G.
Published by
Pearson
ISBN 10:
0134074254
ISBN 13:
978-0-13407-425-2
Chapter 4 - Section 4.4 - Naming Igneous Rocks - Eye on Earth 4.2 - Page 122: 2
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