Across
- 2. mass extinction of about 90% of marine species and 70% of terrestrial species
- 4. the result of a force applied to a surface
- 5. appearance of first flowering plants
- 7. a layer filled with sedimentary rock from the same age
- 11. presence of numerous marine algae species
- 14. appearance of 1st dinosaurs
- 16. appearance of first amphibians and insects
- 17. a solid inorganic substance
- 18. preserved remains of an organism
Down
- 1. extinction of a large number of species
- 2. person who studies the ancient life
- 3. a star, main source of light and heat in the solar system
- 4. multiplication of reptile and insect species
- 6. Also known as "The Age Of The Dinosaurs"
- 7. formed by compressed sediments
- 8. when the remains of an organism harden
- 9. to adjust to its surroundings
- 10. wind, water or other natural agents
- 12. a long period of history with occurring events
- 13. hard pieces that form the frame of each human
- 15. group of organisms that can reproduce