During which time period did most of the coal under earth’s surface begin to form?

A. Mesozoic
B. Cenozoic
C. Paleozoic
D. Precambrian

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

All of the following statements about the biosphere are true except: a. light and heat from the sun do not affect the biosphere. b. the biosphere gets resources from earth's crust, hydrosphere and atmosphere. c. like "biology", the name for the biosphere comes from the greek word for life. d. the biosphere includes all living organisms on earth's surface.

Uncle tom's cabin started out as a series of articles printed in the national era, a newspaper.