[WhiskeyX]

That would certainly explain why there is so much water being accumulated in that region of the mantle.

[familyop]

"That would certainly explain why there is so much water being accumulated in that region of the mantle."

Yes, Whiskey X-ray. As a non-geologist, non-astronomer, I'll follow the scent to answer the question, "Does more of the water rise and evaporate to the surface through the trench?" ...when time allows, to see what geologists have found.

One of my near ancestors was a rockhound. It sparked an interest, and more recent, local political market tussles sparked another (hired a geologist a few years ago to debunk something).