When Laurentia collided with Gondwana during the Alleghanian orogeny, a broad region of warped, faulted rocks formed, the remnants of which still crop out in the Appalachian and Ouachita Mountains. This broad region of deformed rocks is called

D.haka is the first answer and a.canberra is the second answer

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