Melting glaciers deposited rock, clay and other materials that formed '?'

C14 hope it your welcome

Add the map and the options so i can further you, you so much. : )

Answer cratons

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.