Instructor`s

1. Explain how growth rate can be used to assess additions or deletions of the population.
Growth rate is the percentage of increase that the population has gained or lost in a particular period. To determine population growth rate, it is essential to identify the total number of individuals in a given population and the specific time at which growth rate is calculated. When there is addition in the population, it signifies an increase in the population due to increase in birth rates and increase in the number of immigrants. Deletion in the population pertains to reduction in the total number of people living in a certain area due to increase in the number of death rates and increase in the total number of individuals migrating to another country. Growth rate determines the number of birth rate and death rate and the total number of individuals in the community at a certain period.
2. What are the reasons supporting the argument that soil degradation is most pronounced in those areas of the world where the densest population occur.
Human lives are predominantly dependent on soil. Buildings and houses are built with soil as one of the materials. Plants which give off oxygen and foods grow roots in soil. Shelter and foods are among the basic needs of people. Cultivation and urban development contribute to the soil`s extinction or endangerment. The remarkable change in the modern city has changed man`s life in a tremendous way. With more population, more people will be cultivating the land to accommodate the need for materials in building infrastructures. Soil is very important to human survival. People, animals, and plants depend on soil. With increased number of population, food production has to increase to meet the needs of the people. To increase food production, the land has to be cultivated to grow crops thus leading to soil degradation.
References
Un.org (1995). Population and Land Degradation (Text). [online] Retrieved from: http://www.un.org/popin/fao/land/land.html [Accessed: 8 Sep 2013].