Mount Washington, Oregon, USA
U.S. Geological Survey photo by Lyn Topinka (fair use policy)
Mount Washington is a nearly extinct volcano in the High Cascades of Oregon, just north of Three Sisters peaks and west of the town of Bend. It's a composite volcano, thick basalt flows at the base and mixed flows and ash making up the top of the pile. Glaciers and the general instability of volcanoes have together eroded it to the state we see today. A small eruption occurred on one flank about 1300 years ago, but it's basically dead, after just a few hundred thousand years.
