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.

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

Science fair project which measures the shadow cast by a meter stick at various times in order to predict the circumference of the earth.

This science fair project idea examines the distance a person travels on an average day and to relate that to an understanding of the size of the Earth.

Science fair project which determines whether it is numerically possible to be connected to every person on the earth within six degrees of separation.

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.

What cause the phases of the moon? Make a model to see how the positions of the Sun, Moon, and Earth cause the crescent, gibbous, quarter, full, and new moon.

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.

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

This project uses science and art to help students learn and teach others about Earth's endangered and extinct species.

How do the phases of the Moon and gravity cause spring tides and neap tides? Does the Sun play a role in the tides? Figure it out in this fun science project!

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

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 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!

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

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

Science fair project which compares the rate of temperature change and the maximum temperature as a result of the angle of light radiation.

In this experiment you explore how tectonic plates move to create land and expand bodies of water.

In this experiment, students find out what happens when a less-dense fluid interacts with a denser one, replicating the effect of cooler solid rock on magma.

Explore the craters, maria, and highlands on the surface of the Moon! In this fun science project you'll create a 3-D model of the moon using paper mache.

In this experiment, you'll make a seafloor spreading model to learn more about how plate tectonics work and create mid-ocean ridges.

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!

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.

Science fair project that determines whether mass and weight are the same or different.

Find the North Star, and measure your latitude! The purpose of this science fair project is to find latitude and learn about geographic locations.