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Petrified Wood: A Journey From Tree to Stone
science.howstuffworks.com/environmental/earth/geology/petrified-wood.htm
Petrified wood can be found all over the world, but how is it created?
10 Extinct Hominids
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Decades of fossil discoveries have revealed much about the extinct members of our hominid family tree, but we're far from having all the answers. What have we learned from some of these fascinating finds?
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?
Mammatus Clouds Look Like Fluffy Bubble Wrap in the Sky
science.howstuffworks.com/nature/climate-weather/atmospheric/mammatus-clouds.htm
Mammatus clouds, which are made from falling air instead of rising air, are one of the most spectacular cloud formations you'll ever see.
Mt. Vesuvius: Eruptions, History, & Information
science.howstuffworks.com/nature/natural-disasters/mount-vesuvius.htm
Scientists predict that the next eruption of Mount Vesuvius will be violent. Find out what damage could be done if Mount Vesuvius erupts.
Test Your Knowledge: Airports Quiz
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Airports are the weird in-between places where humans wander during their journeys. How much do you know about the world's airports?
What Are Geodes and Where Can You Find Them?
science.howstuffworks.com/environmental/earth/geology/geodes.htm
Imagine walking through a dusty, arid landscape when you stumble upon a seemingly ordinary rock. Its rough exterior might not catch the eye, but what lies within surely will. Geodes are one of nature’s most spectacular treasures, offering a glimpse into the geological processes that shape our Earth.
How Do Fossils Form? A Journey Through Time
science.howstuffworks.com/life/evolution/question609.htm
What is a fossil? How do they form?
Tibetan Glacial Ice Core May Hold Clues About Climate Change
Scientists from The Ohio State University have drilled longest ice core from outside the poles.
Portland Cement: A Concrete History With Structural Integrity
science.howstuffworks.com/innovation/inventions/portland-cement.htm
Invented in 1824, Portland cement remains prominent in modern construction. Learn about the hydraulic binder's raw materials and applications.