Which will most likely form when the movement along a plate boundary forces a landmass to be pulled apart?

The study of where things are 

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Answer. first blank ; ; ; clockwise; the second blank; ///clockwise;

What are the choices