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.
Bolivia is the poorest country in South America, ranking 108 out of 186 countries on the UN Human Development Index of 2013. While the adult literacy rate is over 90 percent, nearly 35 per cent of Bolivians live on less than US$2 a day. Life expectancy at birth is 64 for men and 69 for women.