Simply saying, enthalpy is the measure of heat content of a system at constant pressure. Thus it is the thermodynamic potential of a system, which is obtained by summing internal energy(U) & Product of pressure(p) & volume(V) of a system.
They are all rocks and they are all solid
It is an sp hybridization
A. gravity (of any planet/star/celestial body around )
D. Inertia
E. Centripetal force