Chapter One Vocabulary

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Across
  1. 2. Large round pits.
  2. 5. The amount of matter in an object.
  3. 8. Chunks of rock or dust from space.
  4. 12. An object that orbits the sun, is large enough to have become rounded by its own gravity and has clear the area of its orbit.
  5. 14. The movement of one object around another.
  6. 16. The tendency of an object to resist a change in motion.
  7. 17. A force that attracts all objects toward each other.
  8. 20. The rise and fall of the oceans water that occurs every 12.5 hours or so.
  9. 21. Occurs at a full moon when Earth is directly between the moon and the sun.
  10. 22. A body that orbits a planet.
  11. 23. When an object in space comes between the sun and a third object, casting a shadow on that object.
  12. 26. The measure of the force of gravity on an object.
  13. 28. A giant ball of hot gas, mainly composed of hydrogen and helium.
Down
  1. 1. Earth's path around the sun which is slightly elongated.
  2. 3. The imaginary line that passes through Earth's center and the North and South poles.
  3. 4. Dark, flat areas of hardened rock formed from huge lava flows that occurred 3-4 billion years ago.
  4. 6. The very darkest part of the moon's shadow that strikes Earth.
  5. 7. The sun's pull is at right angles to the moon's pull - producing a tide that is the least difference between consecutive low and high tides.
  6. 9. Occurs when the moon passes directly between Earth and the sun, blocking sunlight from Earth.
  7. 10. The noon sun is directly overheard at the equator. Means equal night. Day and night are about 12 hours each.
  8. 11. A long cold mixture of dust and ice that gives up a long trail of light as it approaches the sun.
  9. 13. The spinning of Earth on its axis. Causes day and night.
  10. 15. A streak of light produced when a small object burns up entering Earth's atmosphere.
  11. 18. A pattern or group of stars that people imagined to represent a figure, animal or object.
  12. 19. The sun appears farthest north of the equator once each year and farthest south once each year. Aligns with shortest and longest day of the year.
  13. 22. The combined forces of the sun and moon produces a tide with a greatest difference between consecutive low and high tides.
  14. 24. The different shapes of the moon seen from Earth - caused by the motions of the moon around Earth.
  15. 25. The less dark, larger part of the moon's shadow that strikes Earth.
  16. 27. A system of organizing time that defines the beginning, length and divisions of a year.