We wanted to make a lava so collected together the things we would need…
A plastic bottle
Add vegetable oil to fill 2 thirds of your bottle.
add water and leave about an inch at the top of the bottle.
Add a few drops of food colouring, wait for the colouring to break through the oil to the water
add about a quarter of an alka seltzer tablet to the bottle and watch… (make sure you leave the lid off as pressure will build up) add more tablets as and when desired or just pop the lid on and swish back and forth for a cool effect.
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