Mariana Trench: new tectonic plate and surprising deep sea volcano?

Mariana Trench record deep tectonic plate volcano rocks

Not just perhaps a new tectonic plate discovered deep in the Mariana Trench but also surprisingly deep volcanic activity at over 3 miles deep with volcanic glass evidence. New deep undersea tectonic plate discovered? … a sample collected from an earlier expedition suggested that a previously undiscovered tectonic plate lies at the bottom of the …

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