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1. Fossil that forms when a mold is filled with sediment and hardens into the shape of an organism
T S L S A I C O S F
2. Fossil that forms when organic material is pressed between layers of rock
A B S Z R I C F S O D E O L N I
3. Theory that states that the gradual shifting of Earths plates causes continents to change their global positions over time
E R T O N A T L N T H I F R E O N I C Y T D
4. The matching up of rock layers from different locations
T R A O N I E L R C O
5. The boundary formed by the collision of two lithospheric plates
A U E G T O R L A C B O D E N Y E T R N N P V
6. The boundary between two tectonic plates that are moving away from each other
T A R T B I N P U E G D E O L V Y D N E A R
7. Very large division of geologic time; usually referred to as the longest division of time.
N E O
8. Subdivision of an eon (Paleozoic, Mesozoic, Cenozoic)
R A E
9. Subdivision of a period; shortest division of geologic time
C H E O P
10. Occurs when a species dies out and no longer lives on the planet
T C X T I O E N N I
11. Remains or impressions of an organism preserved in petrified rock
O L F I S S
12. Refers to the information provided by all the discovered fossils throughout geologic history
R L I D O O S S E R C F
13. The process of becoming a fossil
D Z I I E S F O S L
14. The branch of science involving the physical composition and history of the planet
O O G G L Y E
15. The system of time management involving the formation and changes to Earth
C G E E L A C I G L T S E O O M I
16. The time needed for half of a sample of radioactive substance to undergo radioactive decay
F F I E - H L L A
17. An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different number of neutrons ( therefore a different atomic mass)
O P T O E S I
18. A common fossil found in many areas from a specific time; used to help identify the age of other formations
L X S I D I N F O E S
19. States that younger rock is found above older rocks when comparing undisturbed sedimentary rock layers
I P O F S R P O L A U W T N E S I O
20. Fossil that forms when minerals solidify into rock around shape of the original organism leaving a cavity behind.
I S D S O F M L L O
21. A subdivision of the eras in geologic time
D I E O R P
22. Fossil that forms when organic material is trapped in ice rock amber or tar
D E I E S S L S E R P F R O V
23. Method of determining the age based on measuring radioactive elements
D V O C A I N G D I T R I A E T A
24. Determination of the age of a rock based on the surrounding elements
E A A T R E I G L E V
25. A fossilized piece of evidence of an organism activity like a footprint
L E S R T A C I O S F