There are many different kinds of caves. Most caves are solution caves and they occur in karst areas. However, there are some caves that occur in non-karst such as lava tubes, talus caves, sea caves, tectonic caves and glaciers.

• 3-D Tour of Mammoth Cave National Park

  http://3dparks.wr.usgs.gov/mammoth/

• A virtual cave tour - with excellent photographs from solutional caves, sea caves, lava tubes, and erosional caves.

  http://www.goodearthgraphics.com/virtcave.html

• A USGS site on Lava tubes in Oregon, Washinton, California and Hawaii

  http://vulcan.wr.usgs.gov/Glossary/LavaTubes/description_lava_tubes.html

• Glacier Caves

  http://glaciercaves.com/html/glacie_12.htm

Cueva Chica, Puerto Rico
Photo: Mike Lace