Place a small plastic bottle in the centre of a tray., Build (or Shape) modeling clay or damp sand around the bottle to create a mountain shape (or slope)., Pour two tablespoons of baking soda into the bottle using a funnel., Mix a few drops of red food coloring and a squeeze of dish soap into a cup of vinegar., Pour the vinegar mixture into the bottle., Watch as the chemical reaction creates "lava" that flows down the sides.

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