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Across 3. Today the only _________ on Mars is either frozen in the polar caps, or underground. 5. Biggest volcano in our solar system. 6. Has at least 63 moons. 7. Has almost no air. 9. Mercury has a _________ surface. 12. On Jupiter the sky slowly becomes the _______. 15. Mercury is a world of _________. 16. Jupiter's ocean has no _________ on which you could float a boat. 18. Once had rivers, streams, lakes, and even an ocean. 19. A moon.

Down 1. A gas found in the sun's core. 2. Earthquakes on Venus. 4. A gas found in the sun's core. 8. Mercury and Venus have no _________. 10. The sun is glowing because of _________ reactions in its core 11. Super hurricane that has been raging for at least 300 years. 13. Venus is the same size as __________. 14. A moon. 17. The surface of the Sun is much __________ than its atmosphere. 18. The sun contains about 98% of all the _______, or rocks, dust, and gas in the Solar System.