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 global literacy rate for all males is 90.0% and the rate for all females is 82.7%. The rate varies throughout the world with developed nations having a rate of 99.2% (2013); Oceania having 71.3%; South and West Asia having 70.2% (2015) and sub-Saharan Africa at 64.0% (2015).