When water meets a lava 'block', the lava is converted into an obsidian block. If water meets 'flowing' lava then the lava is turned into cobblestone.
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Put a block of anything into the hole that the lava is coming out of and it will stop. Works with water falls also.
Obsidian is created whenever water flows on top of still lava.
Its a fluid block. you need mcpatcher to change water or lava.
You can find lava underground.
look at water,lava,a cow an press LT