Answer:
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
What goes up and down but does not move?
found at the back of the book.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I go up and down at the same time. Up towards to sky and down towards the ground
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.