Jeremy's crossword

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Across
  1. 2. , the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
  2. 4. , how much matter a object has
  3. 6. , a substance made by mixing other substances together
  4. 7. , firm and stable in shape
  5. 11. , where the neutrons and the protons are in a atom
  6. 13. , a celestial body moving in an elliptical orbit around a star
  7. 15. , the 4th state of matter
  8. 16. , a celestial object consisting of a nucleus of ice and dust
  9. 17. , the action of rotating around an axis
  10. 20. , the positive charged particle of a atom
  11. 21. , vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.
  12. 22. , a negative charged particle of a atom
Down
  1. 1. , the degree to which a specified material conducts electricity
  2. 2. , matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape and no fixed volume
  3. 3. , any thing with a ph under 7
  4. 5. , the rate at which something happens or is done
  5. 8. , a substance that flows freely but is of constant volume
  6. 9. , an atom or molecule with a net electric charge due to the loss or gain of one or more electrons
  7. 10. , a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light
  8. 12. , a substance formed from two or more elements chemically united in fixed proportions
  9. 14. , a small rocky body orbiting the sun
  10. 18. , the building blocks of all matter
  11. 19. , any thing that has a ph over 7
  12. 20. , the degree of highness or lowness of a tone
  13. 23. , the neutral charged particle in a atom