The answer would be b) push factors
Unless you have some classified the answer is no. United Stated and Russia are not in an official Cyber War, although I would not be surprised if we would soon find out they are going at one another through those means.
The correct answer is C) Seafloor spreading
This new oceanic crust is gradually moved away from the ridge itself. Seafloor spreading is one of the reasons of the continental drift
Hey there,
The answer is "Brazil"
Hope this helps ^_^