Answer:
The little pink nub that helps rectify mistakes.
What occurs four times in every week, twice in every month, only once in a year but never in a day?
What goes up and down without moving?
In your fire you hear me scream! Creaking and whining yet I am dead before you lay me in your hearth.
What ten letter word starts with gas?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.