Photos illustrate an opening to a lava cave in a volcanic trench (A
), the entrance to Four Windows Cave from the inside of the cave (B
), a skylight in Four Windows Cave (C
), a typical lava cave shape in El Malpais (D
). All photos are from El Malpais National Monument and are copyright Kenneth Ingham; used with permission. Color images available online at www.liebertonline.com/ast
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