Good Riddles

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

Question: Why was the mouse afraid of the water?

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 goes up and never comes down?

Question: A girl lives on the 26th floor of a building. She takes the elevator down to the lobby and goes to school each day. When school is over she goes to the 20th floor on the elevator and walks up 6 flights of stairs to her room. But if she is riding with somebody else on the elevator she goes all the way to the 26th floor.

Why does she do so?