Earth and Space

1. When a original organisms tissues are replaced by minerals which form a rock like material.
3. Disappearance of dinosaurs, aka k/t
4. the continuous physical force exerted on or against an object by something in contact with it.
5. Disappearance of 70% of marine species(coral and fish)
6. Made up of sedimentary deposits with the same characteristics (color,grain size, type of rock)
9. A naturally occurring, homogeneous inorganic solid substance
10. A type of rock formed by the deposition of material at the Earth's crust surface and in bodies of water
13. The star around which the Earth orbits
14. Individuals having some common characteristics or qualities; distinct sort or kind.
15. A remain or trace of an organism that has been preserved for a long period of time in the Earth's crust
17. Disappearance of about 50% of the animal species
18. Disappearance of 96% of marine species and 75% of land species

2. A type of energy source ex. lightning
7. Experts in the study of fossils
8. A long period of time in history
11. The extinction of a species is the disappearance of all individuals belonging to that species
12. Disappearance of more than 50% of the fish, sponges and corals.
16. the process by which the surface of the earth is worn away by the action of water, glaciers, winds, waves