Across
- 7. The Earth has _________ spheres
- 8. The Earth's sphere that has rocks and mountains in it
- 9. The second step of the scientific method is to form a _______
- 10. A dependent variable is something that the experimenter __________
- 12. The Earth's sphere that has gasses in it including oxygen
- 13. The largest unit of time
Down
- 1. The Earth is 4.6 __________ years old.
- 2. An independent variable is something that the experimenter ________
- 3. The Earth's sphere that has all living things in it
- 4. The ____________ Era is the era the dinosaurs walked the Earth.
- 5. The Earth's sphere that has all the water in it
- 6. The Earth's layers include the mantel, the _______, the inner core and outer core
- 11. ________ covers nearly three-quarters of the Earth's suface