Answer:
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
The more holes you cover the lower it goes.
It's in your hand though you can not feel it. Only you and time can reveal it.
In the forest, this blends in just right, but every December it is covered with lights. What is it?
I know a word of letters three. Add two, and fewer there will be!
You can always see it, but it's too far away to touch. Mountains rest on it, and at sea it surrounds you. What is it?