What major factors contribute to some countries being rich and others being poor? (3factors)

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

Will give brainliest asaapppppppppppp plz im in a major hurry to finish which of these pairs of objects exerts the greatest gravitational force on each other? object 1 and object 3 object 4 and object 3 object 1 and object 4 object 4 and object 2

Recrystallization definition earth science