Underwater, there are insane implosions at 25K feet below sea level. At that same depth on land, we have caves.
Why doesn’t the earth compress things like water does? Does gravity do different things to different materials?
In: Planetary Science
Think of it like this:
An arch of rocks? A bridge.
An arch of sand? A pile of sand.
An arch of water? A puddle.
A cave exists because the rock around it is rigid. This rock holds up the ceiling and keeps the space clear.
Sand or water both flow. Nothing is held up. It all flows into the cave, making it no longer a cave.
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