Geology
Geology A large part of Ethiopia is mountainous, and the Highlands are known as the Ethiopian Plateau. The setting of the proposed park area is on a mountain ridge that comes from the north, bends just where the capital is situated, and then descends to the west. The mountain of Entoto, like the bulk of the plateau, consists of volcanic rocks (Egziabher 1988), like reddish rhyolite, trachytes, ignimbrites, tuffs and welded tuffs (Mehari), and black glassy obsidian. Obsidian can be used in decorative ways for building and paving, and welded tuffs are often easy to quarry and can be used for durable construction works or even carved out into caves (Lutgens 1986). The typical soil type of the Ethiopian plateau is Alfisol, described by Foth (1984) as one of the better soils for agricultural use. The principal suborder here is a reddish-brown Ustalf, and cultivation on this type of soil will cause severe erosion by heavy rains (HΓ₯kan Blanck and Pia Englund, Entoto Natural Park 1995)....