What Am I Riddles

Question: When you say my name, I am no longer there. What am I?

Question: You answer me, but I ask you nothing. What am I?

Question: I am duplicate of you, but only lighter. What am I?

Question: You wait for it. It cracks, stays for a moment, and then vanishes before your eyes. What is it?

Question: Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?