This week, we learned about one of our most vital resources, water.  We also learned about the atmosphere and nutrient pollution.  For your Unit 4 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.Over 70% of the earth’s surface is covered by water.  What percentage of that water is fresh and why is most fresh water unavailable for direct use by organisms?Describe the zones of aquifers and how the water table changes over time.Discuss freshwater wetlands.  Name three types and describe their function in nature.Describe littoral, photic, benthic, and pelagic zones in the ocean.Discuss the four layers of the atmosphere.What are the effects of excessive nutrient pollution in surface water ways?edit

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