If granite and marble were exposed in an area with hot and humid .

I guess there should be an options to choose. Anyway I know the answer. Here it is: If granite and marble were exposed in an area with hot and humid climate, the marble would erode more rapidly.

The sun's parallax would be 180 degrees, greater than which you can't get.  so a. would be your anwser 

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