Tree rings can tell the age of the tree but also information about the world. This science experiment uses tree stumps to discover new facts.

This science fair project compares the allelopathic affects of juglone, a chemical agent produced by the Black Walnut tree, on two plants.

This project determines the age of a tree using a growth factor chart instead of cutting the tree down to count the rings in its base.

What are buttress roots? In this fun science project, make a model of a rainforest tree and learn how they help trees survive in the tropical rainforest!

This science fair project idea identifies trees using a dichotomous key.

In this experiment, young ecologists will learn about a type of edge effect: how trees and plants at the edge of a forest can act as a weed filter.

This science fair project idea explores alcoholic fermentation at work by making your own soda.

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.

Is horse manure a possible energy source in a crisis? Use calorimetry to find out how much energy horse manure can produce in this science fair project.

This science fair project idea provides evidence that air is everywhere and takes up space.

Kids learn about examples of mechanical weathering and conduct an experiment with seeds and plaster in this cool geology science fair project idea.

The objective of this science fair project is to study the photosynthesis process and demonstrate the important role that leaves play in the process.

Can you increase the light and plant growth in your garden using mirrors? In this experiment, measure light reflection and find out!

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

How would you dry your wet clothes if your dryer didn't work? Find out with this fun experiment!

Kids conduct a cool balloon rocket experiment in this fun science fair project idea. Does a greater volume of air mean a greater distance traveled?

How does distance affect the spreading of light? Kids see diffraction and the inverse square law of light in action with this great science fair project idea.

Check out this cool science fair project on identifying rocks and minerals for kids.

This fun and easy middle school science fair project idea explores the topic of pollution and demonstrates if polluted soil affect the growth of green plants.