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rock
Table of Contents
References & Edit History Related Topics
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rock size
The rock cycle: How different types of rock are formed
rock cycle rock textures rock textural terms rock sorting dry bulk densities deformation and confining pressure stress-strain curves general magnetic hysteresis curve
For Students
Slate, a metamorphic rock, showing typical splintery fracture and thin layering (slightly larger than life-size).
rock summary
Quizzes
Cross section of Earth showing the core, mantle, and crust
Everything Earth
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
ore. iron ore minerals, rock, metal, metallic iron
Rocks, Minerals, and More Quiz
Cross section of Earth showing the core, mantle, and crust
The Solid Earth Quiz
Encyclopaedia Britannica thistle graphic to be used with a Mendel/Consumer quiz in place of a photograph.
27 True-or-False Questions from Britannica’s Most Difficult Science Quizzes
Related Questions
Discover
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
Facsimile of one of William Henry Ireland's forgeries, a primitive self-portrait of William Shakespeare(tinted engraving). Published for Samuel Ireland, Norfolk Street, Strand, December 1, 1795. (W.H. Ireland, forgery)
The Time a Law Clerk Successfully Forged a New Shakespeare Play to Impress His Dad
Indian hijras participate in a religious procession in Gandhinagar, India, some 30 kilometers from Ahmedabad, on March 22, 2017. Hijra is a term used in South Asia which refers to transgender individuals who are born male. (gender identity, gender expression)
6 Cultures That Recognize More than Two Genders
Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
7 Winter Solstice Celebrations From Around the World
The Prado Museum facade at the Diego Velaszquez memorial. Established in 1819, the museum is considered the best collection of Spanish art and one of the world's finest collections of European art. Madrid, Spain
20 Paintings You Have to Visit at the Museo del Prado in Madrid
Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
Which Is Correct: Hanukkah or Chanukah?

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Videos

The rock cycle: How different types of rock are formed
The Earth's surface and crust are constantly evolving through a process called the...
Video: Encyclopædia Britannica, Inc.
Learn how the earth keeps itself fresh and new and how the chemical properties of zircon determine the age of the earth
The chemical properties of zircon make it a useful tool in determining the age of...
Video: © MinuteEarth (A Britannica Publishing Partner)

Images

rock size
Rocks can be any size. Some are smaller than these grains of sand. Others, like this...
(Left) © Bobanny; (right) © Martin Fowler/Shutterstock.com
rock cycle
Figure 1: The rock cycle.
Encyclopædia Britannica, Inc.
rock textures
Rocks have many different textures. Layered sandstone produces a gritty texture,...
Encyclopædia Britannica, Inc.
rock textural terms
Encyclopædia Britannica, Inc.
rock sorting
Figure 2: Sorting.
Encyclopædia Britannica, Inc.
dry bulk densities
Figure 3: Dry bulk densities (distribution with density) for all rocks given in Table...
Encyclopædia Britannica, Inc.
deformation and confining pressure
Figure 7: Deformation as affected by increased confining pressure.
Encyclopædia Britannica, Inc.
stress-strain curves
Figure 8: Typical stress-strain curves for rock materials. Each X represents...
Encyclopædia Britannica, Inc.
general magnetic hysteresis curve
Figure 9: General magnetic hysteresis curve, showing magnetization (J) as...
Encyclopædia Britannica, Inc.
Soil regions of the United States, showing areas covered by soil orders of the U.S....
USDA Natural Resources Conservation Service
Slate, a metamorphic rock, showing typical splintery fracture and thin layering (slightly...
John H. Gerard
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