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I'm using procedural shading at a beginner level. So i wanted to sort of mask out where the lava is. How do I do that?

I only want the "rocky" part to be bumpy and not the lava itself

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    $\begingroup$ how does your final result should look like? $\endgroup$ – Sanbaldo Jun 5 '20 at 9:13
  • $\begingroup$ Basically, only the "rocky" or cooled lava part should be bumpy/ or look like rocks. The hots lava (orange parts) should look smooth or less bumpy. $\endgroup$ – Akash Digumber Jun 5 '20 at 16:41
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You should be able to invert the output of your Color Ramp and plug it into the Strength input of your Bump node.

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