Andre is researching the history of theater sound. Help him complete these sentences.
depended on
Theater sound in the 1930s relied on,
to which sound effects were recorded.
the sound person's ability to time the effect with the correct level.

Can someone list any possible solutions to air pollution ?

There is only one climate type in motion across the world at a time

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.