Short difficult what am I riddles for kids

I am a giant sandbox built by nature. I have a coat of gold and a hem of blue, and I am the favorite place for a holiday view. What am I?

I have billions of tiny stones but no mountains. I have waves but no hair. People lie on me to feel the warmth of the sun. What am I?

As small as your thumb, I am light in the air. You may hear me before you see me, but trust that I'm there. What am I?

I am a vehicle. I spell the same when you read me forwards as well as backwards. What Am I?

You can easily touch me, but not see me. You can throw me out, but not away. What am I?

A slender body, a tiny eye, no matter what happens, I never cry. What am I?

I have three eyes but only one leg. I still close one even if you beg. What am I?

I can run, but not walk. Thought is not far behind me. What am I?

Physicists have built devices to move me very fast. My last seven letters can be commonly found in newspapers, magazines and journals. What am I?

I have lot of memories, but I own nothing. What am I?