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Early Earth History
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four:The Precambrian Era lasted how many billion of years?
cycads:The first seed plant found in the Paleozoic Era.
precambrian:The longest era 87% of Earth's history.
amphibians:The first land vertebrates.
trilobite:The most important index fossil in the Paleozoic Era.
igneous:Type of rock found in the Paleozoic Era.
shields:Oldest rocks on earth.
bacteria:First fossils ever found.
fish:First vertebrate.
poisonous:What type of gases where found in the atmosphere during the Precambrian era?
paleozoic:Life came ashore during what era?
period:Eras are broken into small subdivision called what?
mountains:What rose up in the land of North America and Norway during the Paleozoic era?
Early Earth History
Across:2. | Eras are broken into small subdivision called what? | 4. | The longest era 87% of Earth's history. | 6. | Oldest rocks on earth. | 7. | Life came ashore during what era? | 10. | The first land vertebrates. | 11. | Type of rock found in the Paleozoic Era. |
| | Down:1. | The Precambrian Era lasted how many billion of years? | 3. | The most important index fossil in the Paleozoic Era. | 5. | First fossils ever found. | 8. | The first seed plant found in the Paleozoic Era. | 9. | First vertebrate. |
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© 2013
PuzzleFast.com, Noncommercial Use Only
Early Earth History
Across:2. | Eras are broken into small subdivision called what? | 4. | The longest era 87% of Earth's history. | 6. | Oldest rocks on earth. | 7. | Life came ashore during what era? | 10. | The first land vertebrates. | 11. | Type of rock found in the Paleozoic Era. |
| | Down:1. | The Precambrian Era lasted how many billion of years? | 3. | The most important index fossil in the Paleozoic Era. | 5. | First fossils ever found. | 8. | The first seed plant found in the Paleozoic Era. | 9. | First vertebrate. |
| |
© 2013
PuzzleFast.com, Noncommercial Use Only