Generally formed from fluid basaltic magma. Not terribly explosive.
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Mauna Loa volcano from Volcano House |
Formed from basaltic and andesitic magma. Cinder cones form from slightly more gas-rich eruptions which blow tephra ("cinders") into the sky. This tephra piles up around the vent to form a cinder cone.
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Cinder Cone, a classic cinder cone in Lassen Volcanic National Park, northern California |
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Crater in the summit of Cinder Cone |
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Wizard Island, Crater Lake |
Big, dangerous volcanoes formed of andesite and dacite lava and tephra. These volcanoes do most of their damage through pyroclastic flows, mudflows, and sector collapse.
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Mt. Shasta, northern California |
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El Misti, Peru |
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Mt. Rainier, Washington |
Stubby domes and flows formed from extremely viscous dacite or rhyolite magma. These magmas are less gas-rich than those that form rhyolite flood eruptions.
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Chaos Crags, Lassen Volcanic National Park |
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Rhyolite dome, Mono Craters, California |
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Little Glass Mountain flow, Medicine Lake highland, California |
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Crater Lake, Oregon |
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Crater Lake in snow |
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Halemaumau caldera on the big island of Hawaii |
