Earth's History Crossword
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
                     
 
 
Down: 1) The principle that states that younger rocks lie above older rocks if the layers have not been disturbed.2) A fossilized structure such as a footprint or compromise that formed in sedimentary rock by animal activity on or within soft sediment.3) A break in the geologic record that is made when rock layers are eroded or when sediment is not deposited for a long period of time.5) The process of determining whether an object or event is older or younger than other objects or events.8) The weather condition in an area over a long period of time. Across: 4) A long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climate.6) The trace or remains of an organism that lived long ago.7) Is an ordered arrangement of rock layers that is based on the relative ages of the rocks, with the oldest rocks at the bottom of the column.9) A principal that geologic processes can be explained by current geological processes
 

 

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