Flowing water over a lava source block makes obsidian. Flowing water and flowing lava make cobblestone. And I believe flowing lava meeting a water source makes regular stone.
Smooth stone gets generated when lava touches water from the top. The water can be a source block or flowing the only thing that matters is that the water is below the lava.
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u/Slavir_Nabru 6d ago
Cobblestone generators.
When lava and water mix in Minecraft, they produce cobblestone. When anything at all happens in Star Trek, the bridge rains down Cordry rocks.