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Which major East African mountain range is not volcanic in origin?
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East African mountains
Mountains and lakes of East Africa.
The major East African mountain range that is not of volcanic origin is the Ruwenzori Range.
While most major mountains in the East African region are volcanic, the Ruwenzori Range is a gigantic horst—a block of the Earth's crust that has been uplifted between faults. Geologically, the range consists of an ancient plateau surface of gneisses and schists that was upfaulted on the west and upwarped on the east. This unique formation distinguishes it from the surrounding volcanic highlands, which were created by lavas ejected from fissures or volcanic activity associated with the East African Rift System.123