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.
Asia is the continent with the most hungry people-two thirds of the total. The percentage in southern Asia has fallen in recent years but in western Asia it has increased slightly. Tweet. Sub-Saharan Africa is the region with the highest prevalence (percentage of population) of hunger. One person in four there is undernourished. Tweet. Poor nutrition causes nearly half (45%) of deaths in children under five - 3.1 million children each year.