Answer choice A is the answer
Answer:
Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat. Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents.
I'm guessing a dummy run is something that you use a test dummy to see how something will work, example a crash dummy were they put inside a car that crashes to a solid object . a trial run/procedure kind.
(hope this help)
