Which led to the dust storms of the 1930s?

In one to two paragraphs, compare and contrast the american, french, and mexican revolution.

Which statement best describes a contribution of the works of nicolas copernicus and galileo galilei?

Which one of the following is true of jamestown? sir francis drake founded the settlement in 1619. o john smith was responsible for introducing tobacco. o black slaves were brought to jamestown in 1619.