Answer:
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
You need a key to receive an answer from me. The answer you'll find is straight from your mind. What is it?
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
What English word retains the same pronunciation, even after you take away four of its five letters?
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
What never gets any wetter no matter how hard it rains?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?