Riddles

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Across
  1. 3. What is black when it’s clean and white when it’s dirty?
  2. 7. What has many keys but can’t open a lock?
  3. 8. The more of this there is, the less you see. What is it?
  4. 10. What has to be broken before you can use it?
Down
  1. 1. I’m tall when I’m young, and I’m short when I’m old. What am I?
  2. 2. What can you break, even if you never pick it up or touch it?
  3. 4. Where does today come before yesterday?
  4. 5. What is always in front of you but can’t be seen?
  5. 6. What invention lets you look right through a wall?
  6. 9. What is full of holes but still holds water?