Chapter 4 Vocabulary

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Across
  1. 3. must be round, orbit the sun, and have cleared out the region of the solar system along its orbit.
  2. 6. an object that orbits the sun and has enough gravity to be spherical, but has not cleared the area of its orbit.
  3. 10. trapping of heat by the atmosphere
  4. 11. large round pits on the moon
  5. 12. sun
  6. 13. oval shape
  7. 14. distance between the earth and sun, about 150,000,000 kilometers.
  8. 16. is the force that attracts all objects toward each other
  9. 17. the four large outer planets
  10. 18. clouds of gas and dust form this fuzzy outer layer of a comet
  11. 19. are hardened rock formed from huge lava flows that occured 3-4 billion years ago
  12. 20. stretches out more than 1000 times the distance between the sun and Neptune
  13. 21. solid inner core of a comet
  14. 22. in this system, earth and other planets revolve around the sun
  15. 24. consists of the sun, the planets, their moons, and a variety of different objects.
  16. 26. are loose collections of ice, dust, and small rocky particles whose orbits can be very long, narrow ellipses.
  17. 29. motion of one object around another
Down
  1. 1. Beyond Neptune's orbit which extends to about 100 times Earth's distance from the sun.
  2. 2. region of the solar system between Mars and Jupiter
  3. 4. when an object spins around a central axis
  4. 5. earth-centered model
  5. 7. sphere
  6. 8. inner planets, comes from latin word "terra" which means Earth.
  7. 9. small bodies formed by rock and ice
  8. 15. chunks of rock and dust from space
  9. 23. color
  10. 25. meteoroids that pass through the atmosphere and found on Earth's surface
  11. 27. streak of light caused when a meteoroid enters Earth's atmosphere
  12. 28. thin disk of small particles of ice and rock