The Great Rift Valley is being formed by tectonic plates that are pulling away from each other. What would we expect eastern Africa to look like tens of millions of years in the future as a result of this activity?

At the Great Rift Valley, tectonic plates are moving apart, stretching and thinning the crust. If this continues for tens of millions of years, the rift could widen and sink enough for seawater to enter, separating eastern Africa from the rest of the continent. So the best answer is that a sea will split eastern Africa from the continent.

AI-written and checked against the verified answer.