Rise and Fall

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 tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?

Question: What asks but never answers?

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