Manioc is native to tropical south America, where it was grown, processed, and used by many different groups to make bread and porridge. it spread to the Caribbean and other tropical parts of American during pre-Colombian times and was encounter by the columbus on his first voyage to the new world.
b. THE EARTH GETS CLOSER AND FARTHER FROM THE SUN
I believe the answer you are looking for are basins, Basins have coal and gas deposits
