Third Grade Science Activities and Experiments

Our free, hands-on third grade science activities and experiments are the perfect way to empower third graders to learn cool stuff and think critically about the world around them. For more in-depth science projects, take a look at the Science Fair Project Ideas section of the site.

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Third Grade
Science
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Try this simple activity with your child to guesstimate the age of a tree in your yard and nurture her developing math skills while you're at it!
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What causes sound? Here's a simple science experiment that adds a visual element to the science of sound to help kids better understand this tricky concept.
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Clouds are formed when warm and cold air meet. Here's a way for kids to see it all up close!
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Get your sense of humor ready for this fun science experiment that demonstrates the fundamental physics of air pressure.
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Make your own marshmallows and mix up some very interesting third grade chemistry lessons while you're at it!
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Try the classic balloon-on-the-wall trick with your kid and watch static electricity in action.
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Household items and a bit of imagination will create a CSI kit for your child to have investigative adventures with. Explore the world of forensic science!
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Crystals are a very special structure. In this third grade activity, your child will learn how to grow salt crystals.
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In this 3rd grade science activity, you'll experiment with the little-known fourth state of matter: polymers! Mix borax with white glue and watch what happens.
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This craft is a great way to explore the fascinating world of spiders and their webs as you collect spider webs from around your house with your third grader.
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Your third grader will delight in learning about sound waves as he observes the different sounds created by tapping on glasses with varying amounts of water.
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Here's an interesting activity that will enable your child to make his own magnifier out of a drop of water
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This interdisciplinary card game will have your third grader working on math facts as he travels through the solar system!
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Young scientists develop a hypothesis, conduct an experiment, and then revise their hypothesis to find out which common household liquids dissolve candy corn.
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Explore scientific concepts with this experiment that introduces kids to the scientific method!
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Help your curious third grader construct a dazzling spinning wheel that will teach him about the science behind colors while providing some silly entertainment!
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Do plants breathe? Not exactly. They do respire though! This activity will help your kid with see that plants are producing the oxygen we need to survive.
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Here's a great activity that uses corks and toothpicks to create a fleet of floating boats. Which design makes for the most seaworthy vessel?
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Ready for takeoff! Make science fun and teach about levers and fulcrums as your child sends pennies flying.
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Combine the science of physics with the fun of playing spy. Your young detective can make his own tiny looking glass. It's simple to make!

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