Before It's News | Popular Watercooler
The Earth as a Geode
The easiest way to visualize the formation of the hollow earth is to look at the best example that we have in nature ... that of a geode. Geodes range in size from small rock formations all the way up to large caverns filled with crystals. These features typically form when rock is found in its igneous state and then hardens around a gas bubble.
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