Answer:
I am the red tongue of the earth, that buries cities.
It's like food but water kills it. What is it?
When it comes in, From sea to shore, Twenty paces you'll see, No less, no more.
Many hear me, but no one sees me, and I only speak when spoken to
Come up and let us go. Go down and here we stay
People take me on walks and I run and have fun. What am I?