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The walls were covered with the most delicate and fragile crystals. Many of these crystals were made of gypsum, a mineral that comes from limestone. And there was mile after mile of them. Water is the creator of most caves, but, unlike all other limestone caves,





Caves part 4 pictures


 
 

 
 

 
Planet Earth Caves
Planet Earth Caves
  2
part 2
  3
part 3
  4
part 4