American an european former slaves were brought back to africa mainly in what country? a. liberiab. angolac. south africa d. nigeria

Which best explains why england had the highest standard of living in the world in 1990? a. england started industrializing before the rest of the world b. england had the highest population in the world. c. england hadthe most fertile soil in the world. dengland had more natural resources.

Which factors add to the greenhouse effect and are caused by human activities?

What did the pattern of earthquakes in the wadati-benioff seafloor zones show scientists? a.) earthquakes occur where the ocean floor reaches its highest temperatures. b.) many earthquakes take place 700 kilometers below the seafloor. c.) slabs of ocean floor return to the mantle in subduction zones. d.) ocean - trenches cause earthquakes.