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silica mineral
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Smoky quartz from St. Gotthard, Switz. Amethyst geode from Nova Scotia, Can. Quartz agates from Mexico. Rutilated quartz from Madagascar.
How can glass paint protect surfaces from sunlight?
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silica mineral summary
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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere
Why Do Some Cicadas Appear Only Every 17 Years?
Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.
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Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)
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Illustration for Demystified "How Dangerous is Quicksand"
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Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
Ten Days That Vanished: The Switch to the Gregorian Calendar
Gutzon Borglum. Presidents. Sculpture. National park. George Washington. Thomas Jefferson. Theodore Roosevelt. Abraham Lincoln. Mount Rushmore National Memorial, South Dakota.
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Berries and leaves of the bittersweet nightshade (Solanum dulcamara) plant. Poisonous plant
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Photos and Videos

Smoky quartz from St. Gotthard, Switz.
Amethyst geode from Nova Scotia, Can.
Quartz agates from Mexico.
Rutilated quartz from Madagascar.
How can glass paint protect surfaces from sunlight?
See All Videos and Images →

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