What is released when rocks shift or move along a tectonic plate boundary? (It is a science question)

What is the conversion factor between kg/m^3 and g/m^3. express your experimental values for the densities in kg/m^3.

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?