Etchplain Etchplains are land areas whose subsurface has been substantially weathered, and etched. Weathering of the bedrock does not advance uniformly and the "plains" are not necessarily flat. The African Surface is estimated to have been formed in the period from the uppermost Cretaceous (70 Ma) to the Middle Eocene (45 Ma), and particularly characterises central Africa. Pediplain is extensive plain formed by the joining of very gently sloping, and typically concave, inclined bedrock surfaces.
One of the longest African rivers is also recorded as the world's deepest. What is the measured depth in parts of the river?
Racing what animal, other than a horse, is a popular sport in, for example, the USA, the UK and parts of Africa, often as part of a horse racing event?
