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

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

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

In this science fair project, students will create a model of a shoreline, observe erosion and examine how jetties prevent erosion.

In this science fair project, students make their own rain gauge to measure rainfall.

In this science fair projects, students will grow out the bacteria that collect on air conditioner filters.

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

Have your kid determine if a goldfish can be conditioned to expect food the same way Pavlov's dogs did with this fascinating science fair project.

Observe corn seed germination to learn about dicots and monocots and how plants grow from seeds to seedlings to full-grown plants!

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

Check out this fun and easy 4th grade science fair project idea that tests how gravity induces positive and negative geotropism (gravitropism) in bean plants.

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

In this science fair project, students create their own miniature salt flats at home.

The goal of this project is to create an exciting topographical map out of dough.

Science fair project about work and energy which uses a simple mathematical formula to predict how far a jar will roll down an incline.

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.

Kids will learn how to make a steam powered rocket boat, also called a putt putt boat or a pop pop boat, in this great science fair project for 4th graders.

In this cool science fair project idea, kids conduct the ruler drop test on volunteers to determine whether reaction time can be improved with practice.

This science fair project idea explores plant growth from a bulb, root, and a stem and investigates asexual plant reproduction.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

This science fair project idea determines what household items are good conductors of electricity.

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

This science fair project idea measures out the sugar of various foods and find out whether people can correctly determine how much sugar is in common foods.

In this simple science project, learn about what causes dew and what affects dew formation with a drinking glass, ice, and a soda bottle.

This science fair project idea determines if the color of light affects the growth of plants.

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

In this CD hovercraft science project, students will construct their own DIY hovercraft.

Construct and experiment with a periscope using reflected light rays to gather an image.