The upper Rhine River, Lake Baikal, and Lake Tanganyika all lie within these features, which, like mid-ocean ridges, form by dip-slip faults at divergent zones.
An inactive one of these features is termed an aulacogen, and the largest on land is divided into Albertine and Gregory branches. The topography of these features generally consists of grabens and a notable one begins at the Afar Triangle. These form when magma heated by mantle decompression fill in cracks in the Earth's surface. The upper Rhine River, Lake Baikal, and Lake Tanganyika all lie within these features, which, like mid-ocean ridges, form by dip-slip faults at divergent zones. Including one that marks the boundary of the Nubian and Somali plates, name these geologic features that occur where tectonic plates are separating, such as east Africa's Great one.
An inactive one of these features is termed an aulacogen, and the largest on land is divided into Albertine and Gregory branches.
rift valley [prompt on a partial answer]