It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.
看来，板块上侧冷却的地幔物质的下沉流可能是造成这种深盆地的原因。
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But, if nothing else, "Darwin's Sacred Cause" shows that there is still new material to be gleaned from the life of a man much picked over, and who turned the world upside down.
As the rods heat up, their zirconium cladding can rupture, which releases gaseous radioactive iodine inside, and may even cause the uranium to melt and release much more radioactive material.