What Am I Riddles

Question: I have 3 eye colors yellow red and green when the red eye opens everybody freezes. What am I?

Question: Tear one off and scratch my head. What once was red is black instead. What am I?

Question: Resurrected, they descend by the millions. Sometimes, to nourish and give life. Other times, to take lives or destroy. They have been known to fill entire valleys and block roads only to disappear before executing their long journey back to the top. What are they?

Question: What stays where it is when it goes off?

Question: Rarely touched but often held If you have wit, you'll use me well What am I?