Answer:
These are the bumpy parts of your digits
Environmentalists want to keep this from drying.
What can be any size or shape and gets bigger the more you take from it?
Every country has one, though we are not the same. Waving to our citizens, throughout the wind and rain. What is it?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
It is something you will never see again.