|  Hydrologic 
	Cycle 
		 	
        	 The Hydrologic Cycle
		 Human Impact on the Water Cycle
		 |  Water Supply & Demand 
		 
		 World Water Distribution
		 United States Water Budget
		 Agricultural & Industrial Water Usage
		 Household Water Usage
		 |  Hydrogeology 
		 
		 Key Terms and Concepts
		 What is Ground Water?
		 What is a Ground Water Aquifer?
		 Water Movement in the Aquifer
		 Ground Water and Wells
		 How are Aquifers Replenished?
		 Where does Water from Aquifers Go?
		 Overwithdrawal of Water 
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