Model of the Atom (Niels Bohr). In 1913 one of Rutherford's students, Niels Bohr, proposed a model for the hydrogen atom that was consistent with Rutherford's model and yet also explained the spectrum of the hydrogen atom. The Bohr model was based on the following assumptions. 1.
Landforms. The Great Rift Valley is like a jagged scar on the face of Africa. It extends from South Africa, along the eastern region, and up to the Arabian Peninsula. The Great Rift Valley is a long line of escarpments that have been created by two tectonic plates drifting apart.
Sub-Saharan Africa is, geographically, the area of the continent of Africa that lies south of the Sahara Desert.outh Africa is the largest producer of platinum, with 80% of the total world's annual mine production and 88% of the world's platinum reserve. Sub-Saharan Africa produces 33% of the world's bauxite with Guinea as the major supplier.