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.
The Serengeti (/ËsÉrÉnËÉ¡Éti/) ecosystem is a geographical region in Africa. It is located in northern Tanzania and extends to south-western Kenya between 1 and 3 degrees south latitudes and between 34 and 36 degrees east longitudes. It spans approximately 30,000 km 2 (12,000 sq mi). The Kenyan part of the Serengeti is known as Maasai Mara. The Serengeti hosts the largest terrestrial mammal migration in the world, which helps secure it as one of the Seven Natural Wonders of Africa and one of the ten natural travel wonders of the world.