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

Unlike other seed sprouting projects, this one allows kids to compare five different sprouts (either 5 herbs or 5 flowers) by watching them grow in a glove.

In this popcorn experiment, students can explore how two things made out of the same material can have very different appearances and densities.

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

This homemade barometer allows your little scientist to contemplate and compare different air and weather conditions.

The rock cycle will come alive for your child when he uses broken crayons to create the three basic rock types.

How greasy are your potato chips? Students will use a reliable method to quantify greasiness and compare different brands in this great science fair project.

This science fair project idea examines whether the colors of the spectrum respond differently in the thermal aspect when radiated by the sun.

In this cool science experiment, learn about magnetism and poles, and test magnet strength to find out if two magnets are twice as strong as one.

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.

This project compares the strength of one, two, and three-ply toilet paper.

Discover whether different amounts of water added into a wine glass will produce a different pitch when their fingers are rubbed along the rim.

Demonstrate how you can make your own compass using a magnetized needle. It also allows you to compare magnetic north and geographic north.

In this activity, students will think about the form and function of household objects as they compare and contrast kitchen serving spoons of various sizes and designs.

Determine if gender affects the ability to identify different smells.

This science fair project idea explores the different properties of matter.

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

Science fair project that determines whether cooling eggs helps them be peeled more easily. Compare the time it took to peel each egg.

This science fair project idea explores the different properties & interactions of sugar molecules.

This science fair project idea investigates the ability of different whitening toothpastes to whiten teeth.

This science fair project idea produces sounds by creating vibrations using different objects.

This science fair project idea explores whether white light can be separated into different colors.

In this classic Ivory soap experiment, kids learn what happens to different types of soap in the microwave, and why!

Get down to the rubber with this science project that tests the effectiveness of different types of erasers.

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 light bulb science project includes step-by-step instructions for testing the heat from different light bulbs.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

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

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