Minerals cannot be formed
a. by evaporation
b. in various chemical reactions
c. during the crystallization of magma
d. when a solid substance melts to form magma

A. By evaporation. It is not possible. all of the others are ways that minerals can form.

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

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