What Am I Riddles

Question: What can you touch but not see?

Question: What is that comes out of a man, has no hand and has no legs but can make a hole on the ground?

Question: I am full of light but left in the dark. I have a temper that pushes my single sibling. I have many friends very far away and I disappear in the light when it is my sibling's turn to push me back. What am I?

Question: I always listen to my Master, I never disobey. From my path I never stray to destroy what's in my way. What am I?

Question: I sit on a bridge so you might see just how clear the world can be. What am I?