Matter

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Across
  1. 2. remains constant during boiling of water
  2. 4. occurs at any temperature
  3. 7. a process where solid turns directly into gas
Down
  1. 1. temperature at which substance changes from solid to liquid
  2. 3. when heat is absorbed, the kinetic energy _______
  3. 5. the rate of diffusion of particles in this state is the highest
  4. 6. matter has mass and occupies _____