Why would so many earthquakes originate along the slab of lithosphere that is descending into the mantle?

As the slab descends into the mantle, rheology changes cause the plate to bend and deform, and generates these earthquakes. The trend of such events can be seen in cross-sections of subduction zones

Explanation:

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high