What is elephant toothpaste?

It is the experiment I'm going to do.here are the materials,

#1.a 2litre soda bottle

#2.1/2 a cup of hydrogen peroxide

#3.1 table spoon of dry yeast

#4.3 table spoons of warm water

#5.dish soap

#6.food coloring

#7.small cup

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​#8.bowl