Is it a "volcano bomb"? Some volcanos eject blobs of pretty viscous lava that cool into a roughly spherical shape before hitting the ground.
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Adam 3's Comments
I've been a fan of Mr. Troll's art for close to twenty years now. I'd recommend his books to anybody, especially his most recent, "Sharkabet".
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These look suspiciously like they've been faked in photoshop.
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