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Palisades of the Hudson.
Sheer cliffs
Palisades of the Hudson.
Sheer cliffs with the Hudson River in the background.
Palisades of the Hudson.
A rock cliff
Palisades of the Hudson.
A few people standing at the top of a sheer cliff face.
Erosion near Santa Fe.
Three boulders on a hillside.
Ship Rock, an old volcanic core of black rock.
Four people standing around an early automobile in the desert. In the background, Ship Rock is near the horizon.
Na Pali cliffs of Kauai.
Looking from ocean to eroded volcanic cliffs.
Makapuu, Ulupau Crater.
Looking from grasslands to volcanic crater wall.
Crater of Haleakala. Largest extinct crater in the world, 20 miles in circumferance.
Looking across volcanic crater with cinder cones.
Crater of Halekala. Mauna Kea and Mauna Loa on Hawaii in distance.
Looking down on volcanic crater with cinder cones and other volcanoes in the distance.