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Why Some Animals Eat Rocks to Aid in Digestion
animals.howstuffworks.com/animal-facts/gastroliths.htm
Gastroliths, or "stomach stones," are found in animals from chickens to sea lions. But what are they for?
What's the difference between stalactites and stalagmites?
science.howstuffworks.com/environmental/earth/geology/stalactite-stalagmite.htm
Stalactites and stalagmites are two common cave features that are often mistaken for each other. Learn about stalactites and stalagmites.
Science Projects for Kids: Crystals and Minerals
Science projects for kids with crystals and minerals are great for junior geologists. Start on a science project for kids with crystals and minerals.
When You Wish Upon a Stone ... Make It a Striped One
people.howstuffworks.com/wishing-stones.htm
You may have wished upon a star, but have you ever wished upon a rock? Find a lucky wishing stone and give it a try.
Science Projects for Kids: Chemical Reactions
lifestyle.howstuffworks.com/crafts/science-projects/science-projects-for-kids-chemical-reactions.htm
These science projects for kids show how chemical reactions can change color or cause explosions. Learn science projects for kids: chemical reactions.
Are there CO2 emissions from natural gas?
science.howstuffworks.com/environmental/energy/emissions-natural-gas.htm
Until recently, natural gas was thought of as one of the cleanest fossil fuels. Yet new studies say it may be worse for the ozone layer than coal -- a fuel well-known for its harmful emissions.
Fossil Activities for Kids
lifestyle.howstuffworks.com/crafts/seasonal/fossil-activities-for-kids.htm
Fossil activities for kids are a fun way for kids to find fossils in their own neighborhoods. Learn more about fossil activities for kids here.
How Do Scientists Determine the Age of Dinosaur Bones?
science.howstuffworks.com/environmental/earth/geology/dinosaur-bone-age.htm
Every time a new fossil is found, one of the first things scientists determine is how old that fossil really is. But how do they determine it, and how can they be completely accurate?
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 Do Fossils Form? A Journey Through Time
science.howstuffworks.com/life/evolution/question609.htm
What is a fossil? How do they form?