Answer:
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
What looks back but cannot see?
I have rivers without water. Forests without trees. Mountains without rocks. Towns without houses.
What points the way without a hand. It floats on water but exists on land?
You throw me out when you want to use me and you take me in when you don't want to use me. Who am I?
You use it between your head and your toes, the more it works the thinner it grows.