Across
- 3. FIRST INSECTS
- 6. FIRST REPTILES
- 9. FIRST WINGED INSECT
- 10. ENDED THE TIME OF DINOSAURS
- 13. FIRST FORM OF LIFE ON EARTH
- 14. STUDY OF THE THE EARTH
- 15. FIRST ANIMALS WITH SKELETONS
Down
- 1. DEATH OF THE ENTIRE SPECIES
- 2. LARGEST MASS EXTINCTION
- 4. DEATH OF MANY SPECIES
- 5. STUDY OF LIFE
- 7. CAN BE IN ROCK, AMBER, OR ASPHALT
- 8. FIRST LAND PLANTS
- 11. FIRST JAWED FISH
- 12. GIANT EXTINCT REPTILE