What am i?

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Across
  1. 4. i have no feet, no hands, no wings, but i climb the sky
  2. 5. you use a knife to slice my head and weep beside me when I'm dead
  3. 6. i'm not alive, but I grow. I don't have lungs, but i need air. I don't have a mouth, but water kills me
  4. 8. i can be cracked, i can be made, i can be told, i can be played
  5. 9. i am white when I am dirty, and black when i am clean
  6. 10. it is more useful for when it's broken
Down
  1. 1. if you drop me I'm sure to crack. Give me a smile and I'll always smile back
  2. 2. i can be long or i can be short. I can be grown and i can be bought. I can be painted or left bare. I can be round or square
  3. 3. it can go up and come down without moving
  4. 7. lighter than what i am made of, more of me is hidde, than seen