Question

question 3
what may frequent earthquakes in an area indicate?
sea floor spreading
tectonic plate boundaries
mantle convection

Explanation:

Earthquakes occur mainly at tectonic plate boundaries. When plates interact (diverge, converge, or slide past each other), stress builds up and is released as earthquakes. Sea - floor spreading is a process at divergent plate boundaries but is more about new crust formation. Mantle convection is the driving force for plate movement but not the direct indicator of frequent earthquakes in an area like plate boundaries.

Answer:

tectonic plate boundaries