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siliceous rock
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Two examples of siliceous rock: chert (left), and flint. noncarbonate, nonclastic sedimentary rocks
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
Discover
Martin Luther King, Jr.
Why We Celebrate MLK Day
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A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Apollo 12 astronaut Charles "Pete" Conrad stands beside the U.S. flag after is was unfurled on the lunar surface during the first extravehicular activity (EVA-1) Nov. 19, 1969. Footprints made by the crew can be seen in the photograph.
How Many People Have Been to the Moon?
Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile
6 Lost Civilizations
African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.
Timeline of the American Civil Rights Movement
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Photos

Two examples of siliceous rock: chert (left), and flint.
noncarbonate, nonclastic sedimentary rocks
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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