InstructionsFor this assignment, you will complete the fourth essay of the scenario-based case study. The essay should be a one- to two-page narrative focusing on arguments that support what the authors discuss in Chapters 7 and 12, as well as other research that you conduct related to these concepts. The questions below may help you in focusing your essay on the one or two concepts chosen. The plume of a fire burning in the apartment contains three zones. What are the differences between the layers in the zones? When a fire plume hits a ceiling, it spreads horizontally, radiating thermal energy and accelerating fire growth. Why is this important to understand? A two-way flow occurs through the doorway of a fire room. The inflow through the lower portion of the opening is driven by air entrainment into the flames. The mass outflow through the upper portion of the opening is slightly higher due to the added mass of the combustion products. Why is this important for firefighters to understand? The ventilation pattern can change during a fire. What determines the hot upper layer temperature and optical density during a fire in a compartment with an opening? What is the neutral plane? Why is understanding the neutral plane critical to life safety? Use APA guidelines, and summarize your response. To supplement your discussion and support your conclusions, you should use information from the CSU Online Library from reputable, reliable sources, such as journal articles, case studies, scholarly papers, and other sources that you feel are pertinent. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations following APA guidelines. You must include at least three sources, including your textbook. NOTE: This assignment is part of Unit I through Unit VII projects that will be assembled into the final project for Unit VII. This assignment must be submitted and graded by the professor, who will provide feedback to you. Your assignment will be graded according to the assigned rubric. The professor will grade and annotate items that need to be corrected for your final project. This feedback from the professor will help you correct any discrepancies before including this assignment in the final project. In addition, implementing the feedback will help you submit a quality project and achieve an overall better review and grade.