RAIN - condensed moisture of the atmosphere falling in separate drops
                                                            
RAIN GAUGE - instrument for measuring the amount of water vapor in the air
                                                            
RAINFALL - the total amount of rain falling within a given area and a given time
                                                                         
RECYCLE - to convert into a form in which it can be reused
                                                                                     
RESERVOIR - a natural or artificial lake or pond in which water is stored for use
                                                                                                
RESOURCES - available assets
                                                                                                           
RIVER - a natural stream of water larger than a creek an emptying into an ocean, lake, or another river 
                                                                                                                       
RUN OFF - water that flows on the surface or through the ground into streams, rivers, lakes, and ocea