East and Southern Africa, were, 220 million years ago, at the centre of Gondwanaland, and situated over the south pole.
The most significant feature of Tanzania's Geology is the Great African Rift Valley.
Ol'doinyo Lengai (Ol Doinyo Lengai) is Tanzania's only remaining active volcano, altho there are many dormant ones, including the mighty peak of Kilmanjaro.
Mount Meru - the second highest mountain has suffered a recent (geologically) explosion and the resulting debris has create an interesting not-yet ware eroded landscape around Momella soda lakes
The famous Kilimanjaro - 5895m at its central Uhuru peak is actually volcanoes, Uhuru, Kibo, and Mwenzi.
A seldom climbed, but nevertheless a formidable 3400m free-standing cone is Mount Hanang - the forth highest, south of Lake Eyasi.
The deep South of Tanzania has several crater lakes - Rongai (3400m) and Ngozi - much more accessible.
A little known interesting geological feature is the masasi mounds - huge granite rocks popping up seemingly out of nowhere.
Tanzania, like much of Africa has rich mineral deposits and has large gold mines, gem mines adn of course the exclusive to a single mine - Tanzanite.
The great African Rift Valley.
Lake Tanganika - 2nd deepest lake to Lake Baikal in Russia, and Lake Malawi both features of the great African Rift Valley are about with fish.
Ngozi Metoerite in the Deep South is the worlds 8th largest meteorite.