May I have a more specific explanation for the following statement, "Earth's crust is extremely thin in trenches, and the heat flow beneath the trenches is half that found in the abyssal plain, implying that heat is consumed in trenches"?

Flynn_17

In tenches, which tend to be area of deep depression in the ocean floor, which is primarily a basalt bed, the heat created by the movement of magma is lessened. In fact, it is around half of the heat that could be expected, showing that the depth of the trench consumes the heat of the magma that moves underneath the thin area of crust under the deep depression. Aug 26 05, 4:34 PM