That Mountain, That Gravity

There's a mountain that I'm under.
It feels like lead and even leaves the mark.
A dark, gray mark.
I don't know it's a mountain.
From down here it is pitch black, buried in the earth.
But the heat is there.
And I've had notions.
At times I thought it was a volcano,
But it was easy to laugh it off and attend something else.
Ignoring the rumbling
That has been building.
But it's getting too loud to ignore anymore.
The sound is becoming more distinct.
And booming and encapsulating.
And it's getting hotter.
And I'm getting nervous,
Because the ground is starting to shake
And I have started to understand that I'd better attend
The volcano.