This is an image of Crater Lake in Oregon, USA. Click on image
for full size Image from: U.S. Geological Survey Mt. Mazama was
once among a group of volcanoes stretching along the coast of
Washington and Oregon. This group of volcanoes includes Mt. Hood
, Mt. Rainier , and Mt. St. Helens 6850 years ago, Mt. Mazama
erupted for a final time. The eruption occured over a number of
months, and produced major outbursts of ash, lava, and hot
vapors. Following this series of eruptions, the cone of the
volcano collapsed into the ground, and Mt Mazama became dormant
except for activity which formed a small cinder cone in the
center (shown in this picture). The collapsed volcano filled
with water and became what we now know as Crater Lake. The
Indians who lived near Mt. Mazama when it fell have a different
story of what caused the mountain to collapse. Shop Windows to
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Cinder cones are simple volcanoes which have a cone shape and
are not very big. Compare the s