When subjected to metamorphism, limestone becomes

Nation of conflicting ethnic groups

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answer any resource, such as wood or solar energy, that can or will be replenished naturally in the course of time;