The two molecules will only react if they have enough energy. By heating the mixture, you are raising the energy levels of the molecules involved in the reaction. Increasing temperature also means the molecules are moving around faster and will therefore "bump" into each other more often.
homeostatic imbalance is the answer, because it's when the internal environment cannot remain in equilibrium.
Resources found in lithosphere: gold and iron etc
Resources found in atmosphere: Water vapor, gases etc.
