Across
- 5. grade 4: rays from the sun that cause sunburn
- 8. all grades: a planet that ancient people associated with agriculture
- 9. grade 5: layers of sand built up over time
- 10. grade 4: a state in which no vibrations or sound waves can be transferred
- 13. grade 6: one of Jupiter's moons, which is also the name of a continent on Earth
Down
- 1. grade 4: electrical cells and resistors connected to each other
- 2. grade 6: a group of stars
- 3. grade 5: the process whereby rocks are broken down by wind and rain
- 4. all grades: a physical phenomenon associated with the presence of charged particles, something we use every day in the modern world
- 6. grade 6: a building containing instruments for observing stars and planets
- 7. grade 6: chunks of rock from planets that have broken up
- 11. all grades: a planet named after the Roman god of war
- 12. all grades: a huge star around which the earth orbits