1. Q: How many planets are there in the Solar System? C: 8 ------------------------------------- 2. Q: What planet is closest to the sun? B: Mercury ------------------------------------- 3. Q: What is the second planet from the sun? D: Venus ------------------------------------- 4. Q: What is the third planet from the sun? A: Earth ------------------------------------- 5. Q: What is the fourth planet from the sun? B: Mars ------------------------------------- 6. Q: What is the fifth planet from the sun? D: Jupiter ------------------------------------- 7. Q: What is the seventh planet from the sun? B: Uranus ------------------------------------- 8. Q: What is the sixth planet from the sun? A: Saturn ------------------------------------- 9. Q: What is the eighth planet from the sun? D: Neptune ------------------------------------- 11. Q: Which planet is not a gas giant? C: Mars ------------------------------------- 12. Q: Which planet is not a terrestrial planet? A: Saturn ------------------------------------- 13. Q: What is the most volcanically active body in the solar system? B: Io ------------------------------------- 14. Q: Which planet has the largest ring system? D: Saturn ------------------------------------- 15. Q: How much meteoritic material do scientists estamate falls on the Earth each day? D: more than 1000 tons ------------------------------------- 16. Q: Which is the densest planet? B: Earth ------------------------------------- 17. Q: What is the largest terrestrial planet? D: Earth ------------------------------------- 18. Q: What is the only known moon of Pluto? B: Charon ------------------------------------- 19. Q: What is the Earth radius? A: 6378 Km ------------------------------------- 20. Q: What is the rotational period of Earth? C: 24 hours ------------------------------------- 21. Q: Where is the main asteroid belt in the Solar System? D: Between Mars and Jupiter -------------------------------------