Good Riddles

Question: I break down buildings I crumble mountains You can't see me What am I?

Question: You are in a jungle and you come across a lion and a jaguar. You have a gun but there is only one bullet left. Which one do you shoot?

Question: People are scared of me but I am loved by some. I can be your best friend but could become your enemy in a blink of an eye. What am I?

Question: At a neighborhood there is a house in the middle that is red, the one to the left that is blue, and the one to the right that is green. The red house contains red bricks, the blue one contains blue bricks, what does the green one contain?

Question: I float when I am born, lay down when I am alive, and run when I am dead. What am I?