science

1. the science of determining if one rock layer, fossil, or geologic event is older or younger than another without finding its exact numerical age in years
4. Earth's structure is the inner core
7. the placement of one thing on top of another
10. hard protective outer layer created by sea organisms
11. any preserved remnant, impression, or trace of an animal, plant, or other organism from a past geologic age
12. eukaryotic organisms that constitute the kingdom Plantae.
13. Earth's current geological era
14. the length of time that a person has lived or a thing has existed

2. extinct, shelled marine mollusk belonging to the cephalopod group
3. extinct marine arthropods that form the class Trilobita
5. Age of the Dinosaurs
6. fossilized remains of prehistoric reptiles that lived millions of years ago.
8. the time, events, and existence that happened before the present moment
9. a major geological era lasting from about 541 to 252 million years ago
11. remains - bones, scales, teeth, and other hard parts of fish recovered from archaeological sites, fossil beds, or organic waste.