Across
- 4. how old is Earth?
- 5. What does MYA mean?
- 6. Is the Cenozoic, Mesozoic, and Paleozoic an eon, era, or period?
- 7. How many eras does the Phanerozoic Eon have?
- 9. What era are the Permian, Carboniferous, Devonian, Silurian, Ordovician, and Cambrian periods in?
Down
- 1. How many periods does the Phanerozoic Eon have?
- 2. what era are the Quaternary, Neogene, or Paleogene periods in?
- 3. How many eons does Earth have?
- 5. What era are the Cretaceous, Jurassic, and triassic periods in?
- 8. Are the Cenozoic, Mesozoic, and Paleozoic in a eon, era or a period?