A new deep-Earth analysis reveals colossal structures beneath Africa and the Pacific that may be older than complex life, and far more extreme than anyone imagined. When a magnitude 8.0 earthquake rattles a remote corner of the Pacific, the initial jolt lasts only seconds. But the planet does not simply fall silent. For hours afterward, the ground continues to hum at frequencies too low for human ears, the entir... [6040 chars]
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