Earth axis
arctic circle
ropic of cancer
equator
pic of capricorn
sun rays
antarctic circle

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

The peak above is part of the  sierra madre occidentals ,  a chain of volcanic mountains that runs through the middle of central america.