Aden crater is a volcano that erupted and created its crater above the Robledo Fault that gave, rise to the Fissure and subsequently the Afton Lava Flows. Here one can see lava tubes as small as a regular sewer line or as large as a house, some even on Hawaii can be as tall inside as a three-story building. Unfortunately most of the lava tubes in our area have been destroyed or are caved in due to the high number of earthquakes and the incredible amount of movement on the Rio Grande Rift. This rifting is the slow pulling apart of the plates in our area. As a result due to the fissure, Afton's flows were able to produce a lot of lava before being shut down and covered by Aden Crater.