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3rd Grade Science Fair Projects

For their 3rd grade science projects, kids begin investigating the answers to their questions much like actual scientists would. Instead of simply collecting qualitative data (describing what they observe), 3rd graders graduate to collecting and presenting quantitative data by measuring their results with increased accuracy, communicating their findings in simple charts and graphs, and describing their observations in written prose. Education.com's collection of 3rd grade science fair projects give kids the opportunity to apply their newly acquired skills to thinking critically about the world around them while having serious fun in the process. Browse our collection of third grade science projects and experiments by using the boxes to the left to filter by topic and find an exciting science project your child will be sure to love.

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The moon doesn't produce its own light, so why can we see it shining in the sky? Learn about reflection and planetshine in this fun and easy science project!
Third Grade
Astronomy
In this experiment, kids will see if pruning tomato plants makes them more fruitful and learn about the factors that contribute to a plant's fruit production.
Third Grade
Botany
Did you even wonder why some rocks are round and smooth while others are broken up into small pieces?
Third Grade
Geology
This science fair project explores how osmotic pressure forces water through the root up into the plant.
Third Grade
Elementary School
Marshmallows are made of sugar, water, and air pockets.  Since the marshmallow is flexible, will air pressure cause it to expand when heated in a microwave?
Third Grade
Elementary School
In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!
Third Grade
Easy
In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.
Third Grade
Fourth Grade
Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.
Third Grade
Fourth Grade
Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!
Third Grade
Engineering
Learn about savanna flora and fauna in this science project! Take a look at characteristics of tropical grassland plants and animals that help them survive.
Third Grade
Ecology

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