By eHow Hobbies, Games & Toys Editor
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A hovercraft is an object that hovers or moves above a surface. A balloon hovercraft is made from an old CD, cardboard, pipe and a balloon. Balloon hovercrafts are often used for elementary age science projects. Each hovercraft needs a hole for the air in the balloon to escape. The air that escapes from the hole makes the craft hover.
eHow Hobbies, Games & Toys Editor