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Some rift valleys, such as the East African Rift Valley in Ethiopia and Kenya, have formed over large domes. Upwelling of hot material within the underlying asthenosphere not only pushes the overlying lithosphere up but heats it as well, causing it to expand. To some extent the upward bulging of the lithosphere causes it to stretch, and this stretching manifests itself as a rift valley. Rift valleys that have formed in this way are commonly associated with extensive volcanism.