THREE RHYMING RIDDLES

1)
As fast as an eagle, as slow as a slug,
As tall as a tree, as small as a bug.
Sometimes in front, sometimes behind,
Never on top, and always aligned.

2)
What do you use from your head to your toes,
And the more it works, the thinner it grows?

3)
What grows on a tree
And sails the sea?

Answers:

1. Shadow
2. Soap
3. Bark