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Across
  1. 4. A doctor who treats disorders of the nervous system.
  2. 6. A simple machine that uses a rope or chain to lift heavy objects.
  3. 7. A doctor who treats diseases of animals.
  4. 8. The leafy vegetable that is a source of Vitamin A.
Down
  1. 1. A simple machine represented by a drawing pin.
  2. 2. The natural satellite of the Earth.
  3. 3. The galaxy in which the Earth is located.
  4. 5. The first artificial satellite launched into Earth's orbit.