Chemical weathering involves the change in the composition of rocks, often leading to a 'break down' in its form. This is done through a combination of water and various chemicals to create an acid which directly breaks down the material.
Zimbabwe is often reported to have the highest adult literacy rate on the continent. A recent news article claimed that 90% of the population is literate. The data does not back up the claims. Researched by Kate Wilkinson.
Illiteracy Around the World. In 2003, the United Nations launched the United Nations Literacy Decade (UNLD) with the slogan, 'Literacy is freedom.' Operating under the premise that 'literacy is a human right,' the initiative aims to improve literacy efforts, increase global literacy levels and reduce poverty.