the east african rift valleys are good examples of what type of plate boundary
East African Rift The rift is a narrow zone that is a developing divergent tectonic plate boundary, where the African Plate is in the process of splitting into two tectonic plates, called the Somali Plate and the Nubian Plate, at a rate of 6–7 mm (0.24–0.28 in) annually.[2] As extension continues, lithospheric rupture will occur within 10 million years, the Somali plate will break off, and a new ocean basin will form.
Great Rift Valley The Great Rift Valley is a continuous geographic trench, approximately 6,000 kilometres (3,700Â mi) in length, that runs from Lebanon's Beqaa Valley in Asia to Mozambique in Southeastern Africa.[1] The name continues in some usages, although it is today considered geologically imprecise as it combines features that are today regarded as separate, although related, rift and fault systems.