What Am I Riddles

Question: What goes up, lets out a load, then goes back down?

Question: I have numbers on my face but can't find 13 any place. What am i?

Question: I am often known as a symbol/mark, and can be used in a trend. I am created when two paths meet, but separate at the end. What am I?

Question: What can you see but not hear?

Question: I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me; lower light I never see.

What am I?