Isla Isabela, western Galapagos: NASA JSC image, STS059(S)085, 04/18/94. L-band (HH) radar image acquired with the Spaceborne Imaging Radar system from the space shuttle Endeavour. Radar image is draped over a digital elevation model to create a 3-D perspective view of roughly 60 by 75 km. Rough lava flows show as bright features; smoother ash deposits and pahoehoe flows are dark. The Galapagos volcanoes are developed over a hot spot derived from beneath the oceanic lithosphere.