Science Puzzle

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Across
  1. 3. What is Earth’s only natural satellite?
  2. 7. Which is a part of the bird lets it fly high in the sky?
  3. 8. What is the lightest element in the periodic table?
  4. 11. What can go up and come down without moving?
Down
  1. 1. What is the organ covers the entire body and protects it?
  2. 2. What is the part of the body helps you move?
  3. 4. What is the closest planet to the Earth?
  4. 5. What helps pump blood through the entire body?
  5. 6. What is most abundant element on earth?
  6. 9. What is the part of the skeletal system protects the brain?
  7. 10. What is the young one of a cow called?