All are riftvalley lakes except?a.Lake Malawib.Lake Victoriac.Lake Tanganyikad.Lake Turkana

To determine which of the listed lakes is not a Rift Valley lake, we need to clarify the characteristics of Rift Valley lakes and the geographical locations of the lakes mentioned.

Rift Valley Lakes

Rift Valley lakes are formed in the basins that result from the divergence of tectonic plates, creating rift zones. The East African Rift is well known for its distinct Rift Valley lakes.

1. Lake Malawi - Located in the East African Rift region, it is a Rift Valley lake.
2. Lake Victoria - Situated between three countries (Uganda, Kenya, and Tanzania) and is not a Rift Valley lake; it is formed by a large basin that is not associated with rifting.
3. Lake Tanganyika - Also located in the East African Rift region, it is a Rift Valley lake.
4. Lake Turkana - This lake is located in the Great Rift Valley and is classified as a Rift Valley lake.

Conclusion

Of the lakes listed, Lake Victoria is the only one that is not a Rift Valley lake.