Geological Time Scale

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Across
  1. 3. A time in Earth's history known for early life forms like trilobites.
  2. 7. A big chunk of time in Earth's history, like the "age of dinosaurs."
  3. 9. The very, very old time in Earth's history before there were many fossils.
  4. 11. The study of Earth's rocks, minerals, and land formations.
  5. 12. A smaller chunk of time within an era, like the "Jurassic period."
  6. 13. The time when mammals became dominant on Earth, including us.
  7. 15. When many species die out, like the dinosaurs at the end of the Cretaceous.
Down
  1. 1. A supercontinent that existed a long time ago when Earth's land was all joined together.
  2. 2. The "Age of Dinosaurs" when big reptiles ruled the Earth.
  3. 4. The last period of the Mesozoic era and the time of T. rex.
  4. 5. A time when lots of new types of life suddenly appeared in the seas.
  5. 6. A time when early dinosaurs started to appear.
  6. 8. Known for the first fish with jaws and the first land plants.
  7. 10. A short, specific period within a larger geological era, like "the Ice Age."
  8. 14. A super long time in Earth's history, like "a billion years."