Matter puzzle

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Across
  1. 2. A gas-like mixture of charged particles.
  2. 4. Theory of Matter states that all matter is made up of atoms that are in constant motion
  3. 5. is the amount of force matter that pushes on an area.
  4. 8. is an object mass compared to its volume.
Down
  1. 1. gas or liquid
  2. 3. any object that has mass and takes up space.
  3. 6. a firm and stable shape
  4. 7. can flow and does not have a specific shape.