Matter

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Across
  1. 2. Man's best friend
  2. 4. particles within a
  3. 8. Has a trunk
  4. 9. loosely packed atoms
Down
  1. 1. Large marsupial
  2. 3. Likes to chase mice
  3. 5. has weight and occupies space
  4. 6. has definite shape
  5. 7. Flying mammal