physical science

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Across
  1. 2. at a temperature where liquid turns into gas
  2. 3. a force that is invisible that attracts any two objects with mass towards each other
  3. 5. made up of 2 or more existing parts or elements
  4. 7. a measure of how quickly a specific material is easily capable to catch fire or burning
Down
  1. 1. a small particle that is found in all atoms
  2. 4. a unit of chemical elements
  3. 6. how much stuff packed into a certain amount of space