Volcanoes
a soda bottle 1/4 cup (60 ml) water 1 Tablespoon (15 ml) baking soda 1/4 cup (60 ml) vinegar a square of toilet tissue a few drops of red food coloring a few drops of liquid dishwashing detergent modeling clay in dark gray and red (or dirt) box to build model in model trees, etc. for the surroundings ................
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