Photo Gallery El Hierro Rumbles

Massive craters on the Canary Islands show evidence of past volcanic eruptions, and another may be on the way. For weeks, the island of El Hierro has experienced thousands of tiny tremors. As the earthquakes intensify, officials worry its volcano could erupt.
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Foto: Manuel Meyer/ dpa
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Foto: Instituto Geografico Nacional
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Foto: Instituto Geográfico Nacional
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Foto: Instituto Geografico Nacional
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Foto: Instituto Geografico Nacional
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Foto: JMN/ Cover/Getty Images
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Foto: Instituto Geografico Nacional