What did the Aztec do to keep farmland fertile? O They used the canals to water crops daily.
They planted crops once a year.
O They rotated certain crops regularly.
O They planted certain crops once.

Ateam of scientists studied the sediment at the bottom of an ancient lake. they were able to determine the weather conditions of the indus valley in ancient times. they found that the entire area had suffered a drought after the monsoons declined. this drought lasted 200 years. because of the drought, there wasn’t enough food or water. the people of the indus valley were forced to leave their cities.

1. what did john w. mackay and george hearst have in common? 2. how did the speculators price land during the gold rush? at what price was the ophir quoted? 3. there were many drawbacks to industrial mining. name one.

Which of these would have been a goal of the ku klux klan in the south during reconstruction? a) registering more potential rural voters b) making sure reconstruction went smoothly c) assisting the scalawags and carpetbaggers d) restoring southern democrats to political power