Across
- 1. A mass ______ is the loss of over 70% of life
- 5. The name of the era that the Ordovician extinction happened during
- 6. The name of the era that dinosaurs lived during
- 8. The eon we are currently living in
- 10. The second eon in Earth's history
- 12. Pangaea was formed during this period
- 13. The third eon in Earth's history
- 15. The Cambrian _____ saw the rapid diversification of life in the oceans
- 16. The era that the Triassic period begins in
Down
- 2. The molecule that caused the first extinction in the early oceans
- 3. The first eon in Earth's history
- 4. The name of the epoch we live in today
- 7. The smallest unit of geologic time on our chart
- 9. The name of the period that all of the Earth's coal was made during (hint: coal is made of carbon)
- 11. The Cambrian period began 541 _____ years ago
- 14. These imprints of once living creatures allow us to see what life was like in the past