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.

Why doesn't the ocean freeze? Students answer this question by simulating the chemical composition and temperature of arctic waters in their own home.

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

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

Test whether plants can grow without sunlight and water.

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

Help your child celebrate the summer and the sun by making a sandy seascape.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

This science fair project idea demonstrates that plants give off water.

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

Find out whether putting something on top of a plant will inhibit its growth.

How does water pressure change with depth? Kids learn how pressure works underwater with this cool and easy demo.

Find out whether packaged seeds actually do expire in this new science fair project idea.

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

Will increasing the amount of salt in water effect how slow or fast the water freezes?

Explore if planting seeds in a certain direction will affect how fast it germinates.

Watch pre-packaged seeds and seeds taken from inside fruits and vegetables grow. Which ones will grow faster? Read more in this science fair project idea.

Create a mini plant habitat with your kid to help teach him what it takes to make an ecosystem work.

How do animals keep warm? In this experiment, find out whether fat insulation resists cold temperatures and learn how this works in the animal kingdom.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

Examine whether distilled water, spring water, or regular tap water yield faster plant growth.

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

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

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

Combine your child's natural curiosity with his developing classification and writing skills by helping him create a backyard field guide.

The objective of this science fair project is to analyze the effects of salinity and temperature on water.

Help your second grade scientist explore the timely topic of wind speed using a version of the classic Beaufort Scale.

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

Learn about the layers of the Earth and make a model! Create a earth layer book, cake, or clay diagram.