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acid ammonia animals bacteria baking baking powder baking soda becomes body bottle breathing bubbles burning called candle Carbohydrates carbon dioxide cause charcoal cloth clouds coal cold compressed constellation contains cooking cooled copper covered cubic cubic foot dew point dish dough earth evaporate fire flame flask force formed freezing fruit furnace glass gravity heat hydrochloric acid hydrogen iron kerosene lakes layers learned light limestone limewater liquid manganese dioxide match means meat melting mercury metal miles milk minerals moon mouth move nitrogen nonconductor oxide oxygen phosphorus piece pipes piston plants potassium chlorate pounds powder pressure pump push rain rises rock salt soap soda soil solution splinter spores starch stars steam stone stopper stove substances sugar sulphur surface temperature test tube thermometer vegetables ventilation warm washing weather weight wind wood yeast zinc