Across
- 3. The path planets follow around the Sun
- 6. The hottest, innermost part of Earth
- 9. A smaller quake that follows the main earthquake
- 11. Large system of stars, gas, and dust
- 13. The point on Earth’s surface directly above an earthquake
- 14. The biggest planet in orbit of the Sun
- 16. The force that keeps planets in orbit around the Sun
- 18. The outermost layer of the Earth
- 20. The layer of gases around Earth
- 24. Imaginary line through the center of Earth
- 26. Type of boundary where plates move toward each other
- 27. Boundary where plates slide past each other horizontally
- 28. The rigid outer part of Earth, made of crust and upper mantle
- 30. The planet closest to the Sun
- 32. Our natural satellite
- 33. The red planet, and the planet NASA visits most
Down
- 1. Type of boundary where plates move apart
- 2. Type of plate whose movement causes earthquakes
- 4. Time taken for Earth to complete one rotation
- 5. A large ocean wave caused by an underwater earthquake or volcanic eruption
- 7. A fracture in Earth's crust where movement has occurred
- 8. A planet known for its rings
- 10. Large explosion marking the end of a massive star's life
- 12. Atmospheric layer where the ozone layer is found
- 15. A spinning motion of a planet on its axis
- 17. Process that causes day and night
- 19. Process where one plate slides beneath another
- 21. Movement of Earth around the Sun
- 22. The thick layer between Earth’s crust and core
- 23. Instrument that detects and records earthquakes
- 24. Small, rocky body orbiting the Sun, mostly in the asteroid belt
- 25. The star at the center of our solar system
- 29. Season experienced in Australia during December
- 31. Currents in the mantle that drive plate movement
- 33. Molten rock that rises at divergent boundaries