How many times has rifting occurred along eastern North America since 600 million years ago?
A) once in the Mesozoic
B) once near the start of the Paleozoic
C) twice, once in the Mesozoic and once near the start of the Paleozoic
D) four times

Question

Quizplus · Accepted Answer

Rifting along eastern North America has occurred twice since 600 million years ago: once in the Mesozoic era, leading to the opening of the Atlantic Ocean, and once near the start of the Paleozoic era, associated with the breakup of the supercontinent Rodinia.

How Many Times Has Rifting Occurred Along Eastern North America