Do Caves Last Forever?

Caves do not last forever. A lot of caves are very old, but most caves just gradually corrode, and the roof gradually gets weaker and rots.

What is a polje?

When the roof rots, it gets weaker and could also collapse at some point. When the roof collapses, it leaves just a large hole in the ground called a polje.

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Do Caves Last Forever?

What is a polje?