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Pour water on lava
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.
You have to get a bucket of water. Pour it on the lava and then mine the obsidian with a diamond pickaxe.
water will put out fire
On contact with water lava will cool rapidly to form rock.
It becomes mud.
it is dull
Magma is cold lava, when a volcano has erupted and lava starts to pour out when it cools down or touches water it turns into a rock cold magma.
salt water
Nothing because pouring hot water in glass will do nothing except fogging the glass as you pour the water
You ruin the radio if you pour water so therefore it will most likely not work unless it is water proof. Not to mention it will short circuit.
Make lots of buckets, take lava, and put it down and pour water, then mine with a diamond pickaxe. If you don't have the diamond pick, and you know what you want, put lava exactly there you want the obsidian, surround it by any material on all four sides, just for safety and pour water on it. you don't have to put all the lava in one go, and obsidian can block lava. I recommend not to mine obsidian where you found the lava in the first place, since water can't flow through obsidian and there can easily be lava below the obsidian to take the obsidian when you mine it.