I found a crack on the ground where there is a lot of heat.

[softwarelove]

I found a crack on the ground where there is a lot of heat.
Something is burning underground there and you'll get injured when you are close to it.
What is the crack supposed to be? 
Is that useful?

[Lurler]

It is simply an environmental hazard. So you should avoid it.
There is nothing to do with it directly