Sunset Crater, San Francisco Volcanic Field

The San Francisco Volcanic Field is a 4,700 square kilometers (1,800 square miles) area in the southern boundary of the Colorado Plateau. The field contains more than 600 scoria cones active in the past six million years. ...

Explosive volcanoes spawned mysterious Martian rock formation

Explosive volcanic eruptions that shot jets of hot ash, rock and gas skyward are the likely source of a mysterious Martian rock formation, a new study finds. The new finding could add to scientists' understanding of Mars's ...

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