Have u tried looking it up on another website?
In general, double integrals calculate volume (or can be interpreted as such).
That is:
gives the net volume under the function

and the x-axis.
However, if

, then the height of the solid is 1 and its volume is equivalent to its base area.
Answer:
c) transform boundary
Explanation:
the plate rub against each other and send shock waves down the entire fault line