Answer:
It happens when something has been cut with H2O.
I can be cracked, I can be made. I can be told, I can be played.
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
Give it food and it will live, give it water and it will die.
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?