Mixed Crossword Puzzle

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Across
  1. 3. A device or equipment that makes work easier.
  2. 5. Type of inclined plane starting with the letter (p).
  3. 6. Changes in the body.
Down
  1. 1. Third planet from the sun.
  2. 2. Type of inclined plane starting with the letter (s).
  3. 3. Smallest planet in the solar system.
  4. 4. A type of machine that starts with the letter (c).
  5. 7. How many planets are in the solar system.