Detail from the wing of a Kamehameha butterfly at the Bishop…



Detail from the wing of a Kamehameha butterfly at the Bishop Museum in Honolulu. It is one of two native species of butterflies in Hawaii, December 1993.Photograph by Chris Johns, National Geographic

Iron and manganese seepage creates streaks on a sandstone wall…



Iron and manganese seepage creates streaks on a sandstone wall on Lake Powell in Utah, July 1967.Photograph by Walter Meayers Edwards, National Geographic