Pinnacles, Crater Lake National Park, Oregon

These tall, narrow pillars known as The Pinnacles were formed during the cataclysmic eruption of Mount Mazama, which formed Crater Lake, Oregon. Volcanic gasses rose through layers of dacite pumice and andesite scoria in vents known as fumaroles. With temperatures of 750 degrees Fahrenheit (400 Celsius), the hot gasses welded the sides of the fumaroles. After erosion carried away the rest of the pumice and scoria, these hardened fossil fumaroles were all that remained.

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These tall, narrow pillars known as The Pinnacles were formed during the cataclysmic eruption of Mount Mazama, which formed Crater Lake, Oregon. Volcanic gasses rose through layers of dacite pumice and andesite scoria in vents known as fumaroles. With temperatures of 750 degrees Fahrenheit (400 Celsius), the hot gasses welded the sides of the fumaroles. After erosion carried away the rest of the pumice and scoria, these hardened fossil fumaroles were all that remained.