8th Grade Earth Science Exam Review Chap 13 Crossword
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
 
 
Down: 1) isotopes that are unstable break down into other isotopes and particles resulting in the release of energy and matter from the nucleus2) Earth’s processes occurring in the present are similar in the past4) remains of species that lived for a short time and were found in many places5) fossils in which the spaces are filled with minerals from ground water9) the age of a fossil12) a thin film carbon left from an organism and preserved as a fossil Across: 3) oldest rocks are on the bottom, younger rocks are on top6) body fossil that forms when an organism decays, or dissolves, and leaves a cavity in rock7) to calculate the absolute age of a fossil by knowing the half-life of the parent(mineral)8) age of something compared with the age of other things10) remains, imprints or traces of animals or plants that died long time ago11) time it takes for half of the atoms in the isotope to decay13) type of body fossil that forms when minerals fill a mold and harden into rock14) gaps in rock sequences. Develops when agents of erosion occur
 

 

Create your own Crossword Puzzle for Free!		  Show Errors as I Type