Fossils Vocabulary Crossword

4. the analysis and study of fossilized feces
7. an extinct sea creature
9. a tunnel or shelter dug by an animal in the ground
10. Rocks formed from layers of sediment
13. a fossil replica of an organism or its trace.
14. a fossil used to determine the relative age of a rock.
16. an impression or other preserved sign of ancient organism activity
19. determining if a rock, fossil, or event is older or younger than another
20. Earth's calendar
21. a scientist who studies Earth's ancient life by examining fossils

1. a common type of fossilization where water seeps into the pores and empty spaces of buried organic material
2. hardened, fossilized tree sap that has undergone millions of years of geological changes
3. the collection of all fossils
5. ancient, layered rock formations
6. a process in which a fuel is heated without air to leave solid porous carbon.
8. a type of fungus that grows as fuzzy
11. determining the exact age of a rock, fossil, or event
12. a geology principle stating that in an undisturbed sequence of rock layers, the oldest layers are at the bottom, and the youngest layers are on top
15. when a live organism becomes gradually turned into a stone.
17. a chemical reaction where one element swaps places with another in a compound
18. preserved remains