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Obsidian is formed when
lava reaches the surface and cools rapidly
lava reaches the surface and cools rapidly
Full Transcript
00:00:01.000 --> 00:00:03.099
Obsidian is formed when
lava reaches the surface
00:00:04.002 --> 00:00:05.002
and cools rapidly.
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Movie Summary
Follows history and wildlife of Yellowstone National Park.