Across
- 3. Gassy layer surrounding Earth
- 5. Cold, white, fluffy precipitation
- 6. Natural satellite of Earth
- 11. Earth's largest ocean
- 13. First element on the periodic table
- 14. Powerful natural event with shaking ground
- 16. Bright flashes of light during a storm
- 17. Liquid that gives life to plants
- 18. Our planet's closest star
- 19. The science of matter and energy
Down
- 1. Force that pulls objects toward the Earth
- 2. Tiny building blocks of matter
- 4. Process where plants make their own food
- 6. Red planet in our solar system
- 7. The study of living things
- 8. Organ responsible for thinking and learning
- 9. Glowing insects that light up the night
- 10. Fastest land animal
- 12. Shiny objects in the night sky
- 15. Cold region with polar bears and ice