The coldest temperature in the atmosphere can be found at the

It can be found in the fourth layer of Earths surface called the thermosphere.

This country likely has a high total fertility rate (tfr).

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