Which of the following statements is true?

p waves can travel through space.
p waves cannot travel through water.
p waves can travel through liquids and solids.
p waves cannot travel through rock.

P waves can travel through liquids and solids.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.