I wonder sometimes what the earth is like under my feet.  What it is like 5 feet down and 10 feet and on and on.  Are there huge boulders or underground rivers, or crystal caverns?  Where does the lava start and what does that transition look like?

What do you imagine the earth is like under your feet?

cheddar cave.

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(photo source)

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Divers exploring a maze of underwater caves on Mexico’s Yucatán Peninsula have identified what may be the longest underground river in the world. The waterway twists and turns for 95 miles through the region’s limestone caverns!

Provided by For Generations to Come Sanctuary (Source)
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