CH22-The Sun, Moon, & Earth System

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Across
  1. 2. the outer region of the sun's atmosphere
  2. 4. large, flat regions of the moon's surface that are made of hardened basaltic lava
  3. 5. a large, dark area on the surface of the moon
  4. 6. seasons are caused by the earth's motion relative to the sun and its ___
  5. 8. we call the 356 named days from January 1st-December 31st a ___ year
  6. 11. some ___ may be cracks in the moon's crust that formed when it cooled and shrank
  7. 13. where gases in the moon's very thin atmosphere mainly come from
  8. 14. this is defined as the distance between the earth and sun
  9. 19. scientists think that the moon has a liquid outer core and a solid ___ core
  10. 20. we know the moon's interior structure is similar to Earth's from collecting data on ___
  11. 21. the moons surface gravity is ___ of Earth's
  12. 23. materials blasted out of a crater during a meteorite impact
  13. 24. these appear to be uplift mountains, extinct volcanoes, and/or rims of impact basins
  14. 26. we can observe how the sun rotates on its axis because of the movement of ___
  15. 28. the visible surface of the sun
  16. 29. astronomers believe that these form when pairs of local magnetic disturbances appear on the sun's surface
  17. 31. the sun is composed mostly of this
Down
  1. 1. a depression on the surface of the moon usually surrounded by circular walls
  2. 2. hot plasma rises to the surface, cools, and descends into the sun's interior again in the sun's ___ zone
  3. 3. the region within the sun where energy travels primarily as electromagnetic waves
  4. 7. compared with the earth, the average density of the moon is ___ dense
  5. 9. the entire range of electromagnetic waves released by the sun is called the solar ___
  6. 10. a continuation of the sun's atmosphere
  7. 12. streams of plasma that rise up into and descend from the sun's corona, often forming loops
  8. 15. severe solar storms that can disrupt telecommunications on Earth
  9. 16. effects from ___ between the earth and moon cause the Earth's spin to slow, the moon orbits faster, and moonquakes occur
  10. 17. the apparent path that the sun follows through the stars as seen from Earth's perspective
  11. 18. the sun is located far from the ___ of the Milky Way galaxy
  12. 20. the moon has a very thin atmosphere because it has too little ___
  13. 22. how many times the moon rotates during one revolution around the earth
  14. 25. a total solar eclipse is usually ___ than a total lunar eclipse
  15. 27. the moon has a nearly perfect spherical shape likely because it rotates very ___
  16. 30. the lunar phase the moon must be in during a total solar eclipse