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.
Afghanistan has one of the lowest literacy rates in the world at 28.1% with males having a literacy rate of 43.1% and females with a literacy rate of 12.6%. The Afghan government considers someone literate if they are 15 years of age or older, and if they can read and write.