3rd and 4th Grade Science Activities

Explore scientific concepts with this experiment that introduces kids to the scientific method!

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

This science fair project idea experiments with spinning color wheels and optical illusions.

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

This science fair project idea explores the different properties & interactions of sugar molecules.

This science fair project idea determines what household items are good conductors of electricity.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd 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!

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Make a spring collage with your child to get them outside and those creative juices flowing!

In this project, you'll build a model of the earth, complete with all seven continents and four major oceans.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

Learn all about balance and motion as your child designs a corn maze!

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Children will learn all about cause and effect as they experiment with potion-making in this Halloween themed activity.

These flying potato poppers make a cool sound, create a celebratory mood, and they can teach your child about the power of air pressure.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

Discover how and which salt melts ice the quickest.

This science fair project idea determines if the temperature of rubber effects how high it bounces.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

This science fair project idea investigates how magnetism can defy the force of gravity.

In this design thinking activity, your child will choose an animal to research, learn about the animal’s habitat, and then replicate the animal's habitat using household items.

Most people assume that cold water freezes more quickly, but could that be false? Does hot water freeze faster than cold water? Let's find out!