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Do different types of oil mix or stack? Find out in this science fair project idea!

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

Science fair project that examines the different types of precipitation, evaluates the density of snow and calculates the ratio of snow-to-liquid.

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

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

In this science and engineering activity, children will explore types of tunnels and their purposes and then design and build a tunnel of their own.

Science fair project which tests various sedimentary, igneous and metamorphic rocks to find out whether one rock family is stronger than the others.

Magnets vary in strength. Have your young scientist figure out which kind of magnet is the strongest when you have him conduct this attractive experiment.

Science fair project which determines whether the size or the thickness of a piece of paper has an effect on how many times it can be folded in half.

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

Science fair project that identifies the differences between soils from different environments and attempts to figure out why those differences exist.

This science fair project idea compares biodiversity between drops of water.

This science fair project idea investigates if fats add to the flavor of food.

Take a dive into the candy jar with this yummy science experiment.

Learn whether Mylar Balloons last longer than Latex Balloons or vice versa.

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 examines how seeds hitchhike on animals and clothing.

This science fair project idea examines the reason boats are shaped and engineered.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

This science fair project idea develops an understanding through experimentation of which shapes are the most structurally strong.

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

This science fair project idea explores whether talking to a plant will help it grow.

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

This science fair project idea creates a sedimentary rock and to investigate what takes place during the rock cycle.

This project examines whether playing music during class helps students learn or if it distracts students from learning.

Science fair project which determines if plants really do need water to grow, or whether they just need to be kept wet.

Is cleaning with lemon effective? Get ready to give this science project some elbow grease and find out if acidic lemons can be used as a cleaning agent.

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

It's not actually that hard to get energy from garbage! Kids learn how to make biogas in the form of methane with this cool and easy science fair project idea.

The purpose of this study is to determine if people can tell the difference between organic and conventional food from looking at, smelling and tasting it.