Based on the estimates of alfred wegener, approximately when did the supercontinent called pangea begin to split apart? select one: a. 430 million years ago b. 300 million years ago c. 180 million years ago d. 50 million years ago

What are economic systems and how do they differ?

Which describes a domestic policy for which president nixon was responsible? the reduction of tension between the democrats and republicans the establishment of the second frontier the reduction of tension between the united states and china the establishment of the environmental protection agency

Which of the following groups of sentences most accurately describes the cuban missile crisis?