section_path: Features/Caves and craters
section_name: Caves and craters
paragraph_text: Caves and craters
  
  Any natural void in the ground which can be entered by a human can be considered a cave. They have been important to humans as a place of shelter since the dawn of humanity.
  
  Craters are depressions in the ground, but unlike caves, they do not provide shelter or extend underground. There are many kinds of craters, such as impact craters, volcanic calderas, and isostatic depressions, such as the one in Greenland. Karst processes can create both solution caves, the most frequent cave type, and craters, as seen in karst sinkholes.