CREATION

3. A solid inorganic substance of natural coccurance
5. A hard, solid organ that forms part of a skeleton
6. The time period where about 96% of marine species and 75% of land species went extinct
7. Another word for fossilization
11. A layer made up of sedimentary rock with some characteristics, for example colour, grain size or type of rock
13. Profession who studies fossils
15. Time period where about 50% of fish, sponges and corals disappeared
18. The coccurance of the wearing away of label
19. A duration of time that lasts a certain amount of time

1. The time period where about 70% of all marine species went extinct
2. Source of energy, for example lightning
4. Eruption of lava and ash
8. The extinction of an entire species
9. Adapting to changed lifestyles, occurs over a large period of time
10. Period of time where all dinosaurs went extinct
11. Formed by the deposition of eroded materials
12. Remains of an organism that has been preserved in sedimentary rock
13. Result to force applied in a perpendicular fashion to a surface
14. The time period where about 50% of all animal species went extinct
16. A group of living organisms consisting of similar individual capable of exchanging genes or interbreeding
17. Large ball of hot gas that sends out UV rays