Ask a ScientistThis is the intro text.
Caves and karst make landscapes diverse, fascinating, and rich in resources, including the largest springs and most productive groundwater on Earth. A total of 175 different minerals occur in limestone caves, a few of which have only been found in caves. Caves and karst provide a unique subsurface habitat for rare animals. Caves preserve fragile archaeological and paleontological materials for millennia. Throughout history people have used caves for many purposes: from guano mining to tourism. The potential of caves as natural laboratories may be their most significant future use.