How to use noise to generate vulcanic-like mountains.

[RedstoneExpert]

Hi,
I am learning custom terrain generation and got stuck at a problem with generating sharp mountain edges. I wan't to achive result similar to this image.

(this is just random image from google)
But when I try to do something as this, the mountain tops are always smooth and rounded instead of this sharp ending. (I am refering to the background)
I tried using the simplex noise, that is...

How to use noise to generate vulcanic-like mountains.

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