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.

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

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

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.

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

People have favorite flavors, but what about ants? Which ant food is the most popular?

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

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

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!

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

With this science fair idea, little scientists will gain valuable insights into the physics behind throwing a baseball.

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

Test whether plants can grow without sunlight and water.

This engaging project encourages young children to practice and refine the important scientific skills of sorting and classification.

This science fair project demonstrates the magic of arches by challenging students to stack telephone books on top of eggs without breaking them.

Can a horse lead itself to the carrot? Train your horse with carrots and boxes and test horse memory in this fun zoology science fair project.

This science fair project teaches students the differences between fruits and vegetables.

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.

There are many benefits to bugs and insects. This science project shows how cockroaches, termites, and other critters benefit our planet.

Have you ever noticed the way a dropped stone makes a fun pattern in a pond or lake? What's the science behind these splashy occurrences?

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.