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Your search for "volcanic rock" returned 143 results
Can You Guess Which Countries These Breathtaking Landscapes Are From?
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Where in the world can you marvel at Earth's biggest canyon, swim in lakes the color of bubble gum, or stroll through endless stretches of red sand? Take our quiz to see if you can match these breathtaking landscapes to the correct country!
Ultimate Guide to the Sicily Wine Region
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The Sicily wine region is among Italy's best. Learn all about the Sicily wine region at HowStuffWorks.
Our Amazing Solar System
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Our solar system has a variety of small objects such as asteroids, comets, stars, meteors, and moons. Find out how they affect life on Earth.
Can You Ace This Quiz About Ancient World History?
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Long before the Internet and gas-sucking automobiles, human beings thrived all over the planet. As their empires rose and fell, they left behind intriguing evidence of their lives. What do you know about ancient world history?
18 Famous Landmarks: Huge Statues, Waterfalls and More
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Some of the world’s most awe-inspiring spots are natural wonders, whereas other famous landmarks offer a peek into the past.
How Salt Works
science.howstuffworks.com/innovation/edible-innovations/salt.htm
Not only do we need to consume salt, we also need it for a variety of nonfood uses. But if it's so important, why do health organizations recommend that we closely watch our intake? Apparently, there can be too much of a good thing. Learn what happens when we overload on salt or get too little of it.
Gemstone Identification Quiz
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Gemstones can tell us so much about ourselves. But what will your knowledge of them say about you? Test it right here, with this quiz.
Is there really water on Mars?
science.howstuffworks.com/water-on-mars.htm
Photographs have recently shown that there may be water on Mars. Find out if there's water on Mars and what that could mean for life on Mars.
What are Saturn's rings made of?
science.howstuffworks.com/rings-of-saturn.htm
What are Saturn's rings made of. Learn about Saturn's six main rings, what Saturn's rings are made of and how Saturn's rings were named.
Drought Caused These 6 Famous Waterfalls to Dry Up
science.howstuffworks.com/environmental/earth/geology/dry-waterfalls.htm
Waterfalls are mainly reliant on precipitation to keep flowing. Here are six famous waterfalls that slowed to a trickle when drought set in.