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Define avalanche and Glof? causes, effects

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

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary.