Fun riddles

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Across
  1. 2. I’m tall when I’m young, and I’m short when I’m old. What am I?
  2. 7. Spell cow in 13 words
  3. 8. What has lots of eyes, but cannot see
  4. 10. What building has the most stories?
Down
  1. 1. What is black when it’s clean and white when it’s dirty?
  2. 3. I am an odd number. Take away a letter and I become even. What number am I?
  3. 4. Which river crosses the equator twice?
  4. 5. I am so simple, that I can only point yet I guide men all over the world.
  5. 6. What is always in front of you but can’t be seen?
  6. 9. I have branches, but no fruit, trunk or leaves. What am I?