crossword Riddles

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Across
  1. 3. What is black when clean and white when dirty?
  2. 4. What is full of holes but still holds water?
  3. 6. What has to be broken before you can use it?
Down
  1. 1. Ihave branches, but no fruit, trunk or leaves. What am I?
  2. 2. he more of this there is, the less you see. What is it?
  3. 3. I’m tall when I’m young, and I’m short when I’m old?
  4. 5. What has many keys but can’t open a single lock?