Answer:
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
What is lengthened by being cut at both ends?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
Hard to catch, easy to hold. Can't be seen, unless it's cold.
Today he is there to trip you up. And he will torture you tomorrow. Yet he is also there to ease the pain, when you are lost in grief and sorrow.
What did the piece of wood say when he saw the screwdriver and screws approaching?