Homeschool science experiment - volcano with my twins

Materials we used:

• Baking soda
• Vinegar
• Food coloring (red obviously)
• Dish soap
• A plastic bottle and a tray

My 7yo twins did this and were absolutely OBSESSED. We did it like 6 times because they kept wanting to adjust the ratios and colors. Second time we added the dish soap and my son's mind was blown by the foam. Total cost like $3 if you already have this stuff at home. Honestly great for a rainy Saturday.