Science Quiz Ch. 8-1 & 8-2 Crossword
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
                        
 
 
Down: 1) the period in the geologic time scale beginning about 248 million years ago and ending about 65 million years ago2) determining the age of an object or event in years, usually by measuring the amount of unstable atoms in the sample 3) the period in the geologic time sclae beginning about 65 million years ago and continuing until the present day 4) describes a species of organism that has died out completely6) determining whether an event or object, such as a fossil, is older or younger than other events or objects Across: 5) the division of Earth's history into distinct intervals of time7) the solidified remains or imprints of a once-living organism 8) the study of the forces that drive the movement of pieces of Earth's crust around the surface of the planet9) the period in the geologic time scale beginning about 570 million years ago and ending about 248 million years ago10) the period in the geologic time scale beginning when Earth originated, 4.6 billion years ago, and ending when complex organisms appeared, about 540 million years ago
 

 

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