How to Make a Mob Volcano in Minecraft Pocket Edition

Today were going to make a simple get awesome mob volcano. I Kidd you not, yes, a volcano of mobs!
This also works for Xbox and PC version

You will need:
1. Water
2.any building block
3. Any mob spawner

Step 1: The Volcano

Create a tall stack of of any block about 8-15 high. Repeat 3 more times to create a tower with a hole in it

Step 2: Load

Fill you tower with anything mob you want (except chickens)

Step 3: Just Add Water

Simply add water to the inside of the top ring
Now just back up and enjoy the show

Step 4: Trubleshooting

If no mobs come out check to see if:
1. Your is too high and the mobs hit the ground to hard and die
2. You placed the water in the wrong spot