Great Rift Valley - ( geology) a depression in southwestern Asia and eastern Africa; extends from the valley of the Jordan River to Mozambique; marked by geological faultsgeology - a science that deals with the history of the earth as recorded in rocks Africa - the second largest continent; located south of Europe and bordered to the west by the South Atlantic and to the east by the Indian Ocean Asia - the largest continent with 60% of the earth's population; it is joined to Europe on the west to form Eurasia; it is the site of some of the world's earliest civilizations rift valley - a valley with steep sides; formed by a rift in the earth's crust |