Answer:
What devours all and can kill a king. Destroy a town and crushes mountains down?
What has feet on the inside but not on the outside?
What always comes into the house through the keyhole?
What is used to yell in a text?
I am the red tongue of the earth, that buries cities.
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?