*Unit 1 Test Review (6th Grade Science)

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Across
  1. 1. What is the term for the force that keeps planets in orbit? Spiral
  2. 6. What is the term for the visible tail of a comet when it nears the Sun?
  3. 8. What is the term for a "space rock" that is still in space?
  4. 9. What is the main gas in Venus's atmosphere?
  5. 10. What is the term for the visible part of a comet?
  6. 11. What does "geo" mean in Greek?
  7. 13. What is the center of the solar system?
  8. 14. What is the name of the scientist condemned by the Catholic Church?
  9. 17. What is the term for the time it takes the Moon to complete a cycle?
  10. 18. What is the term for the process of a planet orbiting another body?
  11. 20. What do we call a meteoroid that hits the Earth's surface?
  12. 21. What is the coldest planet in the solar system?
  13. 24. What phase comes after the Full Moon?
  14. 25. What is the term for the gravitational pull of the Moon on Earth's oceans?
  15. 26. Who developed the geocentric model?
  16. 27. What is the name of the planet known as the "Red Planet"?
Down
  1. 2. What is the term for the mass of gases surrounding a planet?
  2. 3. What is the name of the belt where most asteroids are found?
  3. 4. What is the most widely accepted theory for the formation of the universe?
  4. 5. Who proposed the heliocentric model?
  5. 7. What is the term for the Moon phase when it is not visible?
  6. 12. What is the term for the phase when the Moon is half illuminated?
  7. 15. What is the shape of the orbits of planets?
  8. 16. What is the term for the area where the Moon's shadow falls on Earth?
  9. 19. What type of planets are Mercury, Venus, Earth, and Mars?
  10. 22. What is the largest planet in the solar system?
  11. 23. What is the term for a comet's tail made of dust?