Volcanoes change the earth by
a. slow surface heating
b violent, fast eruptions
c. rapid oxygen depletion
d. keeping mountains from growing

Thomas jefferson was important in the revolutionary era because a) he wrote much of the declaration of independence. b) he was elected the president of the continental congress. c) his philosophies were used in the influential pamphlet common sense. reactivate d) his leadership and moral stand lead to the colonies to fight for the abolition of slavery.