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

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

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.

In this science fair experiment, children demonstrate the relationship between the amount of stuff and the amount of pressure in a closed system.

What is topography? Kids find out by learning to make and read a topographic map in this awesome science fair project idea.

Will potatoes spud or sprout faster in dry, dark, or cold conditions? Find out in this science fair project idea!

In this science fair project, students discover how sedimentary layers form as sediments like mud, silt and sand settle over time.

This science fair project idea investigates how a bottom keel helps keep a boat from rocking back and forth.

What is persistence of vision? With this hands-on science fair project idea, students will demonstrate this cool and dramatic phenomenon in their own classroom.

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

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

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.

Science fair project idea that examines different physical characteristics of a chosen animal. Make educated guesses about evolution based on animal's form.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

Science fair project that develops latent fingerprints on a non-porous objects by converting superglue from a solid state to a gaseous state.

This science fair project idea examines whether plants are still able to grow normally if they are turned upside-down.

Kids construct a single fixed pulley system to learn how pulleys can make work easier in this cool physics and engineering science fair project idea.

This science fair project idea explores whether the process used to dry the beans we eat for food renders them unviable.

This science fair project idea explores how the shape of a boat affects its density and how much weight it can float.

In this free science fair project idea, we learn about surface tension and how it can support mass—in this case, a floating paper clip.

Check out this cool science fair project idea that models the behavior of the cold desert plants: xerophytes and halophytes.

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.

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

The purpose of this science fair project is to explore whether UV light passes through some colors and not others by looking at blue, red, purple, and clear.

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

What do ants eat? Kids find out by observing a colony of ants in this cool zoology science fair project for 4th grade.

This science fair project idea investigates how optical distances change the apparent size of an object as seen through a magnifying lens.