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						lunar features 
						Aspect of the Moon determined by past volcanic activity, meteorite impact and soil fractures.				                 
                
                
					
					
					
                    
                    
                    
                    
					
                    
					
					
    
                    
				 
										
						
						cliff 
						
						Steep rock face shaped by a sea. 						
						
						bay 
						
						Small plain of hardened lava located along the edges of a sea. 						
						
						ocean 
						
						A very large sea. 						
						
						crater 
						
						Circular basin dug out by the impact of a meteorite. 						
						
						wall 
						
						Mountain usually surrounding a cirque. 						
						
						mountain range 
						
						Vestiges of the walls of a once-large crater; semicircular in shape, it can span hundreds of kilometers. 						
						
						sea 
						
						Designates the vast plains of hardened lava forming the dark regions; younger than the highlands, these cover 15% of the surface. 						
						
						lake 
						
						Small isolated plain of hardened lava. 						
						
						highland 
						
						Designates bright regions riddled with craters; these oldest regions cover 85% of the surface. 						
						
						crater ray 
						
						Band that radiates from a young crater, the result of matter ejected during a meteorite impact. 						
						
						cirque 
						
						Vast crater characterized by remarkable relief; varies between 20 and 200 km in diameter.