Across
- 1. People who study and observe the natural world
- 4. The planet we live on
- 5. Star that Earth orbits
- 7. A length of time with specific climate conditions
- 9. Type of cold period or age
- 10. Opposite of colder
- 11. The path Earth follows around the Sun
- 13. Warmer periods between ice ages
Down
- 2. A scientific explanation based on evidence
- 3. To become different over time
- 6. Long-term weather patterns of an area
- 8. Opposite of warmer
- 12. Frozen water, common during colder periods