Energy

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Across
  1. 3. a propagating dynamic disturbance
  2. 5. a portion of the electromagnetic radiation
  3. 6. the core of atoms and made up of protons
  4. 8. one of the four fundamental states of matter
Down
  1. 1. wood
  2. 2. the natural movement of air
  3. 3. an inorganic compound with the formula H₂O
  4. 4. a naturally occurring mixture of gaseous
  5. 5. radiant light and heat from the Sun
  6. 7. a black or brownish-black sedimentary rock