Additionally, check for any loose rocks or debris that could fall, especially if there are signs of erosion or instability. Next, assess the cave's size and ventilation. A cave that's too small ...

The different features here show the different stages of coastal erosion. It starts with a crack in the rock, which widens into a cave over time. Eventually, the sea wears right through the cliff ...

are among the most soluble that exist,” Herve explained. That means the erosion that formed the caves themselves probably happened quickly, shortly after the glaciers that carved Patagonia's ...