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A volcano's vestige

A volcano's vestige: Ko'olau Range, a 34-mile shield volcano rim, now a steepled ridge on Oahu's eastern edge, formed after an eruption sent most into the Pacific Ocean.

#VolcanoLandscapes #PacificCoast #KoolauRange

© Warren Ishii / 500px / Getty Images

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Fire on high

Cotopaxi, Ecuador's 2nd-highest summit, is an active volcano at 19,347ft, situated in the Andean foothills.

#VolcanoLandscapes #RingOfFire #EcuadorianSummit

© Westend61 / Getty Images