There is no difference. Just Rift Valley is shorter to say>
the Grand Canyon was formed by water errosion, the Great Rift Valley was caused by tectonic plate movement (moving apart)
yes
The Great Rift Valley was formed by plate tectonics.
The Great Rift Valley was caused by the edges of two tectonic plates, not by a river. There are rivers in it, though, notably the River Jordan, in the north, which flows into the Sea of Galilee and...