The alternate use of ice and warm water is called ice and fire. \r\n\r\n: pop rocks is a very entertaining snack food. The carbon dioxide contained in pop rocks generates thrust after it is vaporized by heat in the mouth, which makes pop rocks particles jump in the mouth. \r\n The characteristic and selling point of pop rocks is that the interesting candy particles with carbonated gas are popping on the tongue! As soon as this product was launched, it became popular and became a favorite of children.