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.

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

Turn an abstract lesson into a practical craft with the fun and colorful creation of dough earth layers!

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

Collect meteorite dust with a magnet in your very own backyard! The objective of this science fair project is to gather meteorite dust to study outer space.

Do plants get crowded? Have your curious kid investigate how plants respond if they're forced to grow together in a confined space.

Discover flight initiation distance as you play around in the park with this fun bird watching project!

This science fair project idea provides evidence that air is everywhere and takes up space.

Learn about lateral earthquake motion and its effect on high rise buildings in this simple 4th grade earth science experiment.

In this project, all you need is a protractor to learn how to use the altitude of Polaris to find latitude on Earth. Polaris is also known as the North Star.

What causes the seasons to change? Kids find out by modeling the earth's tilt using a globe, flashlight and graph paper in this cool science fair project idea.

Your child can use leaves and grass to create his own outdoor art in celebration of Earth Day...all he needs are is the great outdoors and some creativity!

The next time you've got a restless second grade earth scientist on your hands, use this experiment to demonstrate crystals and make a tasty treat, too!

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Learn about the role of Earth's rotation on the Coriolis Effect and hurricanes in this science project. Model the Coriolis Effect on a hurricane's direction.

Check out this cool science project idea to learn about rocks and explore the cycles of formation, breakdown, and reformation of rocks in the Earth's crust.

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

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

This experiment challenges students to forecast the weather based on the surrounding areas' weather.

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

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

This science fair project idea researches the different layers of the atmosphere and creates a visual representation of the atmospheric layers.

In this free science fair project, build a star clock and learn how to tell time on a clear night by observing the big dipper!

We all know that the Moon has different phases, but it can be hard to figure out why. Try this activity to see how the Moon's phases really work.

How does a compass work? What's a magnetic field? Kids will build their own compass at home to find the answers in this great science fair project idea.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

This kinesthetic learning activity will help your fourth grader get a firm grasp on the immensity of the solar system.

Your kid will delight in creating an extraterrestrial vehicle from goods found around the house. There's no telling where her imagination will go!

Children will learn why and how to compost as they help with the process of filling their compost, turning it, and observing the changes that occur.

Learn how to make a weathervane with this fun and simple meteorology project for fourth graders.