Agent Provocateur writes: "WUSTL has a news bulletin about research which has shown a hidden ocean the size of the Artic. A seismologist at Washington University in St. Louis has made the first 3-D model of seismic wave damping — diminishing — deep in the Earth's mantle and has revealed the existence of an underground water reservoir at least the volume of the Arctic Ocean. It is the first evidence for water existing in the Earth's deep mantle. Full report here."
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