This is a quick, easy science fair project that conveys the idea of density to upper elementary students.

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

Do you think you could walk around upside down -- with your feet in the air and your head on the ground?

This science project challenges students to learn about and classify weeds and discover new practical uses for weeds.

This project explores whether nails, toothpicks, straws, or pen nibs are best for applying ink to paper.

Science fair project that uses muriatic acid to develop fingerprints that would otherwise be invisible.

In this fun science project, learn about what happens to cut fruit and experiment with how to stop apples from turning brown.

Discover which fabrics shrink the most in the wash and why.

examine how passive solar heating works, measure temperature in a parked car on a sunny day. ways to use passive solar heating as an alternative, energy

In this windmill model science project, you will build a windmill to learn about wheel-and-axle machines and how these simple machines are used to do work.

In this cool engineering science fair project, kids learn how to build Hero's engine: an enlightening example of Newton's third law.

Science fair project which examines the relationship between frequency of spider web vibration and spider's response time.

Climates with more snowfall have more coniferous forests and fewer deciduous ? Learn about how pine trees in a coniferous forest adapted to withstand snow.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

This science fair project idea examines whether adding gelatin causes a solid to have a higher melting point and/or melt slower.

This science fair project creates a visual model of whatâs happening to sound waves as a car approaches and then leaves.

This science fair project idea explores whether factors such as temperature and concentration affect the pH of a solution.

Find out whether cast iron or regular teflon pans heat up faster and also retain their heat longer.

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

In this experiment, students will discover how heat and pressure turn clay into slate, phyllite, and finally schist.

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

In this science experiment, do tensile strength test on fishing line, a strand of hair, a rubber band, and any other materials you're curious about!

Kids will make predictions about cricket behavior by conducting this fun and easy experiment which simulates different environments for crickets.

What is the hydrologic cycle and how does it work? Check out this fun and easy science project where you will model and learn about Earth's water cycle!

This science fair project looks one of the most important factors affecting seed germination: water. A fun and easy plant biology experiment for 3rd graders.

Do you have your isopods straight? Learn about sow bug and pill bug behavior by building a terrarium to study them in!

Kids learn about potential energy, and mechanical energy, and how to make power from water with one of our favorite renewable energy projects for kids.

This science fair project idea recreates the movement of planetary bodies in order to learn why they sometimes appear to move backwards.

Step into the fantastic world of colors with a project that explores what shade you -- and your friends -- like best.

Soil is made up of different layers. How far down do you need to dig to find the soil horizon, or the place where bits of leaves and branches become soil?