Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Earthquakes at convergent plate boundaries mark the location of the subducting lithosphere. The motion of the lithosphere as it plunges through the mantle causes the quakes ( Figure below ). At greater depths, the plate heats up enough to deform plastically. Answer: subducting lithosphere
Earthquakes at convergent plate boundaries mark the location of the what?