Across
- 1. Era Answer What group of animals lived from around 1:20 PM to 11:41 PM in Earth's history?
- 4. Earth Answer How old are the rock layers beneath our feet?
- 7. Discoveries Answer What do scientists make by studying the rocks on Earth?
- 10. Geological Layers Answer What do the layers of Earth represent in the analogy used?
- 12. in Earth's History Answer When in Earth's history did humans appear?
- 13. Capsules in Rocks Answer What concept refers to the hidden information within rocks?
- 14. Earth's Wonders Answer What activity is encouraged to appreciate the beauty of our planet?
- 15. Wonder Answer What activity can remind us of the immense age of our planet?
Down
- 2. Estimates Answer How has the age of Earth been calculated?
- 3. Dating Answer What method is used to estimate the age of rocks?
- 5. Rocks Answer How do scientists explore the history of our planet?
- 6. Age Answer the age of our Earth in billion years
- 8. Existence on Earth Answer How long have humans been part of Earth's history, relative to a 24-hour day?
- 9. vs. Humans Answer Who lived on Earth first, dinosaurs or humans?
- 11. of Earth Answer What does the analogy of Earth's history as a 24-hour day illustrate?