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Your neighbor   faithfully applies fertilizer to his lawn to ensure beautiful, healthy green   grass. Explain how your neighbor’s   fertilizing habit affects at least one nutrient cycle.

Your   friend commutes to work every day by driving a standard gasoline-powered   car. Explain how your friend’s commute   affects one or more nutrient cycles. 

Urban   areas typically have lots of pavement and compacted soils. Explain how these impermeable surfaces   affect at least one aspect of the hydrologic cycle