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Examples of Science Fair Projects for Fourth Graders How can water change the way things look? Which magnet is strongest? How does electricity travel through wires? How do batteries work? What objects are attracted by magnets? How is electricity generated by solar energy? How do integrated circuits work? What is the shape of a magnetic field? How can a tomato plant be grafted onto a potato plant? How does overcrowding affect life in a terrarium? Do plants grow better in sunlight or artificial light? How does gravity affect the growth of a plant? How does mold grow? What effects do freezing and thawing have on rocks? Can a compass be shielded from a nearby magnet? Does rust affect the magnetic attraction of a magnet? How are stalagmites and stalactites formed? How do the growth rates of plants respond to varying exposure to light? In what liquids can seeds be germinated? In what type of material do plants grow best? What effect does the amount of water have on a cactus plant? What is the effect on plants growing in varying amounts of fertilizer? What is the effect of vinegar on limestone? Will magnetism pass through paper, water, plastic, and steel?