What Rings Like a Bell But Makes No Sound?

Riddles –

I’m the part of the bird that’s not in the sky. I can swim in the ocean and yet remain dry. What am I?

I can only live where there is light, but I die if the light shines on me. What am I?

What is as big as you and yet does not weigh anything?

I crawl on the earth and rise on a pillar. What am I?

Shadow