The Earth may be humanity's only permanent home in the universe but, at times, the quiet blue marble feels frighteningly unsettled. Volcanoes and earthquakes show that the planet is, indeed, always changing both because of human activity but also in spite of it.
Donna and Stephen James O'Meara have dedicated their lives to studying and photographing these incredible forces. One of their favorites is the Kilauea volcano in Hawaii, seen here, which is the planet's most active.
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Photo credit: Steve and Donna O'Meara /National Geographic Image Collection