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zircon
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Zircon with quartz from Cheyenne Canyon, Colorado
Learn how the earth keeps itself fresh and new and how the chemical properties of zircon determine the age of the earth
zircon crystal
Quizzes
Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
Read Next
Reflections in a diamond. (gem; cut gemstone; optics; refraction)
Cold Stones: 9 Gems That Will Make You Feel Like a Peasant
Discover
US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.
Timeline of the 2000s
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)
Cruel and Unusual Punishments: 15 Types of Torture
Ethel Rosenberg arrested in August 1950. Photograph dated Aug. 8, 1950. American civilians executed for espionage. Spies, communists, Julius Rosenberg
Spies Like Us: 10 Famous Names in the Espionage Game
Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant
7 of the World’s Deadliest Plants
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
What Is the Emoluments Clause?
Human Cannibalism; Johannes Lerii's account of the description of the method the Indians use for "barbecuing" human flesh. Nude Indians barbecuing and eating parts of human bodies; Theodor de Bry.
Cannibalism: Cultures, Cures, Cuisine, and Calories

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Photos and Videos

Zircon with quartz from Cheyenne Canyon, Colorado
zircon crystal
Learn how the earth keeps itself fresh and new and how the chemical properties of zircon determine the age of the earth
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Related Topics and References

Topics

Related Quizzes and Features

Quiz
Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones
Basalt sample returned by Apollo 15, from near a long sinous lunar valley called Hadley Rille. Measured at 3.3 years old.
(Bed) Rocks and (Flint) Stones