A class is exploring seafloor spreading. The students want to learn more about how igneous rock is formed deep within the bottom of the ocean. Which type of plate boundaries should the students study in order to understand seafloor spreading? A. An area where one crustal plate slides underneath another crustal plate.
B. An area where two crustal plates pull away from each other.
C. An area where two crustal plates collide, creating upthrust.
D. An area where two crustal plates slide past eachother.