Why did the plantation system come to play such an important role in the southern economy

Earthquakes are especially common in which of the following regions?

Kublai khan honored his mongol heritage by: a)marring only one wife b)praying facing mecca five times a day c)slaughtering ten chinese officials every year d)building a large enclosed hunting ground at shangdu,his summer palace

Name 3 significant impacts of the tet offensive on the outcome of the war, it's participants, or the public image of the war.