There are numerous deep rifts on the Earth’s surface. Many associated with powerful tensional tectonic forces that are constantly trying to rip or split apart parts of the Earth’s crust. Over thousands of years, the movements of the rifts’ associated plates will open many of these cracks even wider, while moving continents into new positions.
We will not see these changes in our lifetimes because it takes thousands to millions of years to notice such great movements. Right now, we can only measure plate motion a few inches per year, not miles.