What crash crops lead to importation of slave labor in the southern states

The primary agent of contact metamorphism is

What happens to rock when acid reacts with it?

Which of the following best describes brazil's economy from 1650-1880? a. it gradually shifted to manufacturing as the industrial revolution progressed. b. it was based on mining. c. it was based on plantation agriculture, where slaves served as a labor force. d. it was based on small, family-owned farms.