There are several sources of land or soil degredation. all but is a cause of soil or land degredation. a)overgrazing b)over farming c)water erosion d)crop rotation

Ihave no idea what the answer is

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