What percentage of the rocks exposed on the continents originated as sedimentary rocks deposited in ancient ocean environments?

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.

Scientists think that convection currents flow in earth’s a. continents. b. mantle. c. lithosphere. d. inner core.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]