The particles that makeup rock are constantly in motion. however, the rock doesn't visibly vibrate . why do you think this is.

Nevertheless, yet the particles vibrate rapidly. This vibration is the manifestation of the thermal energy of the substance. The vibration of the atoms or molecules in a solid is of very short amplitude: it happens at atomic level, so that vibration is not visible.

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.