this post was submitted on 18 Jun 2024
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Obsidian forms when lava cools very rapidly, limiting crystal growth. The lava pictured above most likely cooled slowly.
Cool. I guess I used lava and obsidian as synonyms.
That's no lava, lava is fluid, magma too.
Depending on when this picture was taken, it's just the outermost layer that's solid. The lava flows from underneath.