Gases can be compressed, because they just take up the space surrounding them. The attractive forces between the particles in a gas are very weak, so the particles are free to move in random direction. They just move along until they collide, either with the walls of the container or with each other. Moreover, gases can be compressed because the particles are far apart and they have space to move into.
You're answer is B. P waves are more dynamic and have a great autonomy to be able generate a earthquake.
Answer
a) For the rock
b) 
for maximum range
c) The value of θ is the same on every planet as g divides out.
S=Vt
110=V(72)
110/72=V
V=1.527m/s
Most reactions are exothemic. If the forward reaction of an equilibrium reaction is exothemic then the reverse reaction must be endothermic.
If a system in equilibrium is heated, it will move in exothermic direction to give out heat energy.
