Identify and explain one pattern that can be found regarding the distribution of food deserts.

Seed plants that lived during the carboniferous impact life on earth today because a. they are the ancestors of all plant life on earth. b. their remains formed coal, which is an important resource. c. they produced fossils that are used to date many geologic events. d. their presence caused oxygen levels to drop, allowing animals to evolve.

Suggest two reasons why irrigation is important for human development of the desert (4 marks)

Which of the following terms describes the layers of air surrounding the earth ?