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.
It is a land of fabulous wealth and of extreme poverty. The subcontinent has a small elite of very wealthy people and a large and growing middle class. South Asia has almost one half of the worlds poor even though it has only 20% of the worlds population. In 1997 the Pakistan-based Human Development Center called the subcontinent the poorest, the most illiterate, the most malnourished, and the least gender-sensitive--indeed the most deprived--region of the world.