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silcrete
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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
Related Questions
Read Next
Tilled farmland. (farming, dirt, soil conservation)
Could We Lose All the Soil on Earth?
Solar system illustration. (planets; sun)
Why Are Planets Round?
Astronomical Observatory of the Mojon del Trigo. Long exposure using the star trail technique. Sierra Nevada National Park, in the province of Granada, Andalusia.
Is Earth Going to Change the Direction in Which It Rotates?
Solar system illustration. (Sun; planets)
A Model of the Cosmos
Paleogeography and paleoceanography of Early Triassic time. The present-day coastlines and tectonic boundaries of the configured continents are shown at the lower right. Continents, continental drift, plate tectonics, Pangea, Laurussia, Gondwana.
Spotting a Supercontinent: How Pangea Was Discovered
Discover
The impeachment trial of Pres. Andrew Johnson, illustration from Frank Leslie's Illustrated Newspaper, March 28, 1868.
What If the President Is Impeached?
World Data Locator Map: Australia
Is Australia an Island?
Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
Which Is Correct: Hanukkah or Chanukah?
Orange basketball on black background and with low key lighting. Homepage 2010, arts and entertainment, history and society
The 10 Greatest Basketball Players of All Time
Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England
7 of the World’s Most Dangerous Festivals
Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics
10 Best Hockey Players of All Time
The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)
9 Worst Generals in History

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duricrust
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silcrete, silica-rich duricrust, an indurated, or hardened, layer in or on a soil. It generally occurs in a hot, arid climate where infrequent waterlogging causes silica to dissolve and be redeposited to cement soil grains together. Silcrete is extremely hard and resistant to weathering and erosion but eventually weathers spheroidally to produce boulders and angular fragments. Inselbergs and other residual hills are often capped by a silcrete layer. In the semidesert of Western Australia, an extensive deposit, almost 10 m (30 feet) thick, has developed from a granite-gneiss parent material.