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 investigation, an oil spill is simulated in a jar to observe the damage that oil spills have on the ocean and ocean life.

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.

Find out whether a longer airplane will fly farther or a wider paper airplane.

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

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

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

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

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

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.

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

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

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

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.