Rocky Planets

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