Answer:
What has one eye but cannot see?
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
I am seen in the water. If seen in the sky, I am in the rainbow, a jay's feather, and lapis lazuli.
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?
You can always find me in the past. I am created in the present, but the future can not change me. What am I?