Mount St. Helens, the massive US volcano that erupted in 1980, is showing signs of life again. Scientists have recorded hundreds of quakes beneath it – the strongest activity since 2008 – raising fears it could erupt once more. This compilation explores other mysteries across the Americas and beyond: giant holes under North America and Greenland, strange concrete arrows across the US, disturbing changes in Greenland’s ice, and an ancient South American supervolcano that may be coming back to life. From shifting continents to deserts swallowing Europe, these discoveries reveal just how many secrets our planet is still hiding.
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