Q. The branch of science involving the physical composition and history of the planet. 

Q. The system of time measurement involving the formation of and changes of the Earth. 

Q. Very large division of geologic time; usually referred to as the longest division of time. 

Q. Subdivision of an eon (Paleozoic, Mesozoic, Cenozoic)

Q. Subdivision of an Era

Q. Subdivision of a period; shortest division of geologic time. 

Q. Occurs when a species( organism) dies out and no longer lives on the planet. 

Q. Method of determining the age based on measuring radioactive elements (radiometric) 

Q. Determination of the age of a rock based on the surrounding evidence 

Q. A common fossil found in many areas from a specific time; used to help identify the age of other formations. 

Q. Remains or impression of an organism preserved in petrified rock. 

Q. Refers to the information provided by all of the discovered fossils throughout geologic history. 

Q. States that younger rock is found above older rock when comparing undisturbed sedimentary rock layers. 

Q. A fossilized piece of evidence of an organism's activity ( such as a footprint)

Q. Fossil that forms when minerals solidify into rock around the shape of the original organism, leaving a cavity behind

Q. Fossil that forms when a mold is filled with sediment and hardens into the shape of the organism 

Q. Fossil that forms when organic material is trapped in  ice, rock, amber, or tar. 

Q. Fossil that forms when organic material is pressed between layers of rock.