How Vehicles Pollute the Air
Learn how vehicles affect air quality, including their contribution to smog.
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 Greenhouse Gases?
This backgrounder explains what greenhouse gases are and how they contribute to climate change.
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?
Marine Microbiology: Meet the Microbes of the Sea!
The ocean is full of very small but very useful creatures called microbes. Without them, none of the sea plants or animals you’ve seen would exist!
Eutrophication: Why you should care about pond scum
When fertilizers from agriculture get into lakes and rivers, big problems can result for aquatic ecosystems, food chains & webs!