Fossils

2. A fossil formed from an organism's remains decaying, leaving only a carbon film
4. A fossil formed from the remains of an organism being replaced by minerals
8. The age of a rock compared to other rocks
10. The law that undisturbed rock layers are younger than the layers below it and older than the layers above it
12. A fossil formed from the print or burrow of an organism becoming stone
13. The age of a rock in years; determined by radiometric dating

1. A fossil created from the remains of an organism leaving an impression in rock
3. The law that formations intersecting rock layers are younger than the layers they intersect
4. A fossil formed from an organism's remains becoming trapped inside ice, amber, or tar
5. The law that fragments or rocks inside other rock are older than the rocks they are inside of
6. A type of element that experiences radioactive decay
7. A fossil formed from sediments lithifying inside a mold fossil
9. The preserved remains of an organism
11. The amount of time before half of the isotopes inside a material decay