Eruption at Mayon - NASA Science
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Eruption at Mayon – NASA Science

At any given moment, about 20 volcanoes on Earth are actively erupting. Often among them is Mayon—the most active volcano…
Scoria Cones on Earth and Mars
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Scoria Cones on Earth and Mars

Since the 1970s, planetary geologists have known that volcanic features cover large swaths of Mars. Early Mariner 9…