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What human activities increase carbon dioxide in the atmosphere?
science.howstuffworks.com/environmental/green-science/human-activities-increase-carbon-dioxide.htm
Although a certain amount of carbon dioxide (CO2) occurs naturally in the Earth's atmosphere, there are several human activities that increase levels of the greenhouse gas.
Can You Identify All of These Ancient Disasters?
play.howstuffworks.com/quiz/can-you-identify-all-of-these-ancient-disasters
The world has been hit with many disasters throughout history, many of which affected the people of the ancient world. Do you think you remember them all? Take the quiz to see if you can weather the storm!
How Sinkholes Work
science.howstuffworks.com/nature/natural-disasters/sinkhole.htm
Sinkholes are much more than holes in the ground. Learn how sinkholes can cause the Earth to swallow up you, your home and your car.
How Refrigerators Work
home.howstuffworks.com/refrigerator.htm
Without the refrigerator, you'd be salting your meat, tossing leftovers and drinking everything warm. Examine the inner workings of this food-preservation icon.
What Is the Greenhouse Effect? Is It Inherently Bad?
science.howstuffworks.com/environmental/green-science/question746.htm
We'd be up a creek without Earth's atmosphere and the greenhouse effect it provides, but it turns out that an overactive greenhouse effect can result in a similarly devastating outcome.
What Is G-Force? How to Calculate G-Forces
science.howstuffworks.com/science-vs-myth/everyday-myths/question633.htm
G-force is explained in this article. Learn about G-force.
Could You Dig a Tunnel Right Through the Center of Earth?
science.howstuffworks.com/environmental/earth/geophysics/question373.htm
Let's say you have a lunch date to make - and it's on the other side of the planet. Wouldn't it be convenient to pop down a hole through Earth's innards? But what would really happen if you did?
The North American Geography Quiz
play.howstuffworks.com/quiz/north-american-geography-quiz
North America encompasses huge expanses of water and land. What do you know about this area's people, geology and climate? Take this quiz to find out.
Why Does the U.S. Use Fahrenheit Instead of Celsius?
science.howstuffworks.com/nature/climate-weather/atmospheric/us-use-fahrenheit.htm
While most of the rest of the world has switched to Celsius, the U.S. continues to use the Fahrenheit temperature scale, apparently out of simple inertia.
How Human Migration Works
science.howstuffworks.com/life/evolution/human-migration.htm
Human migration is the idea that humans developed in Africa and then spread to Europe and Asia. Learn about human migration and how human migration works.