What is Acid Rain?
Acid rain is any precipitation that has an unusually low pH. It can be rain, snow, fog, etc. But what is a low pH and why is this a problem?
What are the effects of acid rain on rocks?
Learn about the chemical reaction that happens between acid rain and limestone.
Understanding the Nitrogen Cycle
What is the nitrogen cycle? How do human activities such as using fertilizer affect the nitrogen cycle? How can this cause greenhouse gases?
How does rain become acidic?
Learn how to make a pH indicator and test water samples.