Some topics are here
just think on
Determine the effects of UV radiation on growth and development of plants or microorganisms.
What is the most effective substance to melt ice? Try salt (sodium chloride), calcium chloride, cat litter, sand, rubbing alcohol, and rock salt.
What section of a city has the most pollution in the form of airborne particles?
What is the effect of a low-level electrical field on the movement of fruit flies?
Does the sun heat salt water and fresh water at the same rate?
Infrared light shows us the heat radiated by the world around us. By viewing animals in the infrared, we can actually "see" the differences between warm and cold-blooded animals.
Sources : http://101science.com/Projects.htm
http://school.discoveryeducation.com/sciencefaircentral/Getting-Started/Investigation.html
http://www.kidsolr.com/science/page2.html
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