Earth History 2 Crossword
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
                    
 
 
Down: 2) When unstable isotopes release energy to form new stable atoms.3) A surface where rock has eroded producing a break/or gap in the rock RECORD.4) Forces within the Earth that cause rocks to break.6) Atoms of the same element that have a different number or neutrons.7) The numerical age, in years, of a rock or object.8) The time required for half of the parent isotopes to decay into daughter isotopes. Across: 1) Matching rocks and fossils from separate locations5) In undisturbed rock layers, the oldest is on bottom.9) A piece of an older rock that becomes part of a new rock.10) The age of rocks and geologic features compared with other rocks and features nearby.
 

 

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