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Building a paper mache volcano is a fun and interactive project.The process consists of two main phases:the actual realization and the eruption!Papier-mâché is a mixture made with glue, water and flour that is applied to strips of newspaper and spread on a cardboard base to build a sturdy mountain.The rash is obtained thanks to the chemical reaction between sodium bicarbonate and vinegar;in some cases Mentos sweets and Coca-Cola Light can also be used.