Earth's History Crossword
                         
                         
                         
                         
                         
                         
                         
                         
                         
                         
                         
                         
                         
                         
 
 
Down: 1) The remains or traces of a plant or animal that lived long ago and was preserved in rock.2) A way to find the exact age of a rock or fossil.3) A long tube of ice taken from glaciers that shows past climates.4) Anything related to Earth, rocks, and how Earth changes over time.6) Comparing things to each other, not giving an exact number. Across: 5) A fossil that shows what an organism did, not its body.7) The time it takes for half of a radioactive substance to decay.8) The exact age or exact number.9) The slow breakdown of radioactive atoms over time.10) Arranged in the order that events happened, from oldest to newest.11) Clues or information that help scientists figure something out.
 

 

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