Answer:
A canvas full of stars.
Lots of them make up a word, And lots of words are in them. It's easy when you think about it. A while ago we stamped and mailed them.
A standard dimension for sandwiches and rulers
It weighs next to nothing but no one can hold it for long. What is it?
I am the red tongue of the earth, that buries cities.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?