Across
- 4. – When one tectonic plate sinks below another
- 7. boundaries – Places where plates slide past each other
- 11. valley – A deep valley formed where plates pull apart
- 13. – The spinning of Earth on its axis, causing day and night
- 14. Wegener – Scientist who proposed the idea of continental drift
- 15. drift – The theory that continents slowly move over Earth’s surface
- 16. – A low area of land where water often collects
Down
- 1. – When Earth is tilted most toward or away from the Sun
- 2. Ridge – Long underwater mountain chain formed at a divergent boundary
- 3. – Openings in Earth’s crust that erupt lava, ash, and gases
- 4. – A division of the year caused by Earth’s tilt and its orbit
- 5. boundaries – Places where tectonic plates move apart
- 6. – Places where magma rises in the middle of a plate
- 8. – Landforms created when Earth’s crust is pushed upward
- 9. – When day and night are about equal in length
- 10. – Earth’s year-long orbit around the Sun
- 12. – The 23.5° angle of Earth’s axis