Kids will learn how to show the direction of magnetic field lines and create a permanent model using iron filings in this great science fair project idea.

This project tests the hypothesis that dark colors absorb more heat than light colors.

This science fair project idea determines if crystals will absorb food dye and if colors will mix by the process of diffusion.

In this project, sunlight is blocked from a leaf in order to see the affect that sunlight has on leaves.

Find out whether we can create motion in a dish and as a result, create a wonderful and colorful show.

This science project uses Mohsâ Hardness Test to show kids how to compare the hardness of different types of minerals.

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

In this project, build an insect model that shows how the head, thorax, and abdomen fit together! Learn insect anatomy by constructing a paper mache critter.

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

How do organic materials become soil? This science experiment measures what materials biodegrade.

Kids often ask, "how tall am I?" This science fair project seeks to determine how well kids can guess their own heights.

This project leads to an understanding that a whole may be built of smaller parts that fit and work together and provides an introduction to basic tools.

This science project lets students explore the number of spots on a ladybird and how to treat ladybugs with respect.

This science fair project idea investigates whether air has mass and weight.

Prove that the Earth is not flat. The objective of this science fair project is to measure the angle of the sun and calculate the circumference of the Earth.

Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

This science fair project teaches students the differences between fruits and vegetables.

The goal of this project is to create an exciting topographical map out of dough.

This science project teaches students to classify different shapes of leaves.

Saturn is the ringed planet in our solar system, a gas giant with rings made of ice and dust. Let's make a cool scale model with an old CD and some glitter!

This science fair project idea demonstrates that light travels in straight lines and experiments with reflecting light.

This science project has students collect wood samples and invent new uses for different types of wood based on its properties.

This science project teaches students the relationship between compost and plant growth. Students conduct an experiment with different types of compost.

This science fair project idea explores the egg's thin membrane.

This science fair project idea explores how enzyme inhibitors, active sites, non-competitive enzyme inhibitors, and substrates work.

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.

How well can people recall what they have observed. Test your knowledge in this fun experiment.

The objective of this science fair project is to examine the effects of temperature on salt and water solutions, as they form crystals over time.

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.