KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Basalt landscape. Eroded landscape formed from basalt, an igneous rock commonly found in the remains of old lava flows. The terraced appearance of the hillside is due to the presence of several lava flows piled on top of each other. Basalt rocks are common, dark and fine-grained. Photographed in Columbia Gorge, Washington State, USA. This region forms one of the largest units of basaltic terrain in the world.
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