(a) Urbanization refers to the process of people moving from rural areas to urban areas, while population density refers to the number of people living in a particular area per unit of land. In other words, urbanization refers to the movement of people to urban areas, while population density refers to the concentration of people in a given area.
(b) Four problems created by urbanization in Tropical Africa include overcrowding, inadequate housing, poor sanitation, and increased crime rates. With rapid urbanization, there is a significant increase in the number of people living in cities, which puts pressure on housing and other infrastructure. As a result, many people end up living in slums, which lack basic services such as clean water, sanitation facilities, and healthcare. This leads to poor health outcomes and increased risk of disease outbreaks. Additionally, rapid urbanization can also lead to increased crime rates due to high levels of poverty and unemployment.
(c) The problems highlighted in (b) can be solved in several ways. First, governments can invest in affordable housing and infrastructure to reduce overcrowding and improve living conditions. Second, urban planning can be improved to ensure that cities are designed to meet the needs of residents. This can include the provision of green spaces, public transportation, and other amenities that make urban living more attractive. Third, public health interventions can be implemented to improve sanitation and access to healthcare. Finally, addressing the root causes of poverty and unemployment can help to reduce crime rates and promote economic growth.