In terms of amplitude how much more powerful is one (1) unit of magnitude? For example, what is the difference between a Magnitude 7 (M7) and an
M8?

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. 

The answer is ocho because ocho is 8

It's either  a. chiang kai-shek and the nationalists turned against the communists and killed hundreds of them. orb. hundreds of peasants were killed in shanghai during the period of warlord rule.  if we take into account that there was warlord rule at the time, i think that it's b (not entirely sure though)just my best thoughts.