1.2 million years old and still forming.
There is no difference. Just Rift Valley is shorter to say>
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...
because there was and eathquake