Across
- 3. The innermost layer of a rocky planet.
- 4. Mercury is the only planet with no _________.
- 6. Venus is the hottest planet because of this effect.
- 7. The planet nicknamed the ‘Red Planet.’
- 8. The main gas in Earth’s atmosphere.
- 10. Venus is named after the Roman goddess of love and beauty. The ancient Greeks called her ________.
- 11. The only planet known to support life.
- 12. Venus has clouds made of this dangerous substance.
- 13. The only planet that spins clockwise.
- 14. The name of Mars’ largest volcano.
Down
- 1. A bowl-shaped depression caused by an impact.
- 2. The type of planet Mercury, Venus, Earth, and Mars are classified as.
- 5. The element that gives Mars its red colour.
- 7. Earth's protective shield against solar radiation.
- 9. A planet's spin on its axis is called this.