The wonders of physics

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Across
  1. 1. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
  2. 3. relating to the interrelation of electric currents or fields and magnetic fields.
  3. 8. take in or soak up (energy or a liquid or other substance) by chemical or physical action
  4. 9. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization
  5. 10. a fullerene consisting of bonded carbon atoms in sheet form one atom thick.
  6. 11. relating to fiction; interposes of fiction
  7. 13. not able to be detected
  8. 15. protect (something, especially an environmentally or culturally important place or thing) from harm or destruction
  9. 17. the chemical element of atomic number 6 a nonmental which has two main forms (diamond and graphite) and which also occurs in impure form in charcoal, soot, and coal
  10. 21. a structure consisting of strips of wood or metal crossed and fastened together with a square or diamond
  11. 23. relating to tension:
  12. 24. the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave:
  13. 25. a thing or event that evokes a specific functional reaction in an organ or tissue
Down
  1. 2. not able to be destroyed
  2. 4. the basic unit of a chemical element.
  3. 5. a person or company that makes goods for sale
  4. 6. hit with force when moving
  5. 7. literature in the form of prose that describes imaginary events and people
  6. 12. the speed of something in a given direction
  7. 14. the quantity of motion of a moving body, measured as a product of its mass and velocity.
  8. 16. a broad piece of metal or another suitable material, held by straps or a handle attached on one side, used as a protection against blows or missiles.
  9. 18. very unusual or remarkable
  10. 19. the strength and vitality required for sustained physical or mental activity
  11. 20. become or makes more intense
  12. 21. the natural agent that stimulates sight and makes things visible
  13. 22. the branch of science concerned with the nature and properties of matter and energy