Ns c

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Across
  1. 3. one of the 12 divided periods in a year
  2. 4. coal,oil and natural gas
  3. 6. date on which day and night are exactly 12 hours long everywhere on Earth
  4. 9. tides that occur at Full moon and new moon and are higher and lower than normal
  5. 12. the transfer of heat in solids
  6. 14. the percentage of energy that is formed when using a machine
  7. 15. pass heat heat from one point to another
  8. 16. the transfer of heat without the particles moving
  9. 17. the person who identified the fracture that keeps the planets revolving around the Sun
Down
  1. 1. a device that turns when steam passes through it
  2. 2. the person who proved the sun is in the middle of the solar system
  3. 5. path of one object in space around another
  4. 7. the unit to measure energy
  5. 8. mathematician( assistant of Tycho)
  6. 10. date on which the suns rays fall onto the earths surface at the furthest distance north or south of the equator
  7. 11. to make something move by pushing or pulling it
  8. 13. instruments with which one can look at stars and planets