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.
The principle languages on the continent include Arabic, French and English. Arabic was ranked the 5th most spoken language in the world by research group Ethnologue, with over 240 million speakers worldwide. In Africa, there are more than 100 million speakers, with Egypt accounting for more than 54 million.