Wegener observed evidence of the similarity between the type and age of rocks at the edges of continents. Which of the following best describes the reason for continents to have the same types and ages of rocks on their edges?

Plate tectonics suggests that Earth's entire crust is composed of a number of large plates that are in constant motion relative to each other. Some plates are sliding under other plates, some are sliding past each other, others are pulling apart, and still others are colliding.