Earth and Space

2. A long period of time
3. Disappearance of 96% of marine species and 75% of land species
4. Made up of sedimentary deposits with the same characteristics (color,grain size, type of rock)
7. the continuous physical force exerted on or against an object by something in contact with it.
10. A type of rock formed by the deposition of material at the Earth's crust surface and in bodies of water
11. A remain or trace of an organism that has been preserved for a long period of time in the Earth's crust
12. Disappearance of 70% of marine species(coral and fish)
14. The star around which the Earth orbits
15. Disappearance of about 50% of the animal species
16. Disappearance of dinosaurs, aka k/t

1. A naturally occurring, homogeneous inorganic solid substance
2. A type of energy source ex. lightning
5. Disappearance of more than 50% of the fish, sponges and corals.
6. The extinction of a species is the disappearance of all individuals belonging to that species
7. When a original organisms tissues are replaced by minerals which form a rock like material.
8. individuals having some common characteristics or qualities; distinct sort or kind.
9. Experts in the study of fossils
13. the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves