Add the food coloring. Add the vinegar. Add enough warm water to fill the bottle. Baking soda is a base. The two ingredients react in the experiment to produce carbon dioxide.
Carbon dioxide is a gas, and because it is heavier than air it pushes the air out of the bottle.
There are more than 1,500 active volcanoes on Earth. Many of them are located along the boundaries of the huge sections or plates that make up Earth's crust. One of the most active geological regions on Earth is known as the Ring of Fire. If so, then it is one of about 20 million that appeared under the tree this past holiday season. They are pushing many new programs that will help in the recycling or re-using of old computers.