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This week, we learned toxicology, plate tectonics, environmental hazards, the rock cycle, and contagious diseases.  For your Unit 3 Complete assignment, write a narrative essay (minimum 1000 words) in which you address and discuss the questions and statements listed below.  Use at least three scholarly sources and remember to demonstrate a thorough understanding of the READ and ATTEND sections in your essay.  Cite your sources in APA format.

• Discuss the four major types of environmental health hazards.  Where does BPA fit in these categories and how can you get exposed to it?  Discuss the precautionary principle.
• Many people across the world die from exposure to infectious diseases.  Why are the numbers so much higher in developing countries as they are in developed countries?
• In what ways does affluence affect the natural environment compared to how poverty affects the natural environment?
• Differentiate between an LD50 and an ED50 response to toxicity.
• Thoroughly describe the rock cycle and tectonic plate movement.
• Why are minerals so important?  Why is there such an issue getting consumers to recycling them?
• Explain how scientist identify and assess risk.