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.
In Africa, death takes the young; in high-income countries, death takes the old The distribution of deaths by age differs markedly between regions. In the African Region, 46% of all deaths were children aged under 15 years, whereas only 20% were people aged 60 years and over.In contrast, in the high-income countries, only 1% of deaths were children aged under 15 years, whereas 84% were people aged 60 years and older.IV/AIDS and TB are the sixth and seventh most common causes of death respectively, and together caused 3.5 million deaths in 2004.As may be expected from the very different dis-tributions of deaths by age and sex, there are major differences in the ranking of causes between high-and low-income countries (Table 2) .