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rock
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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
Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England
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Coriander leaves, fresh green cilantro on wooden background, herbs
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Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
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9 of the World’s Deadliest Snakes
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)
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Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
The Battle of Gettysburg, July 1-3, 1863. (Civil War, Pennsylvania)
9 Worst Generals in History

The concept of hysteresis is fundamental when describing and comparing the magnetic properties of rocks. Hysteresis is the variation of magnetization with applied field and illustrates the ability of a material to retain its magnetization, even after an applied field is removed. Figure 9 illustrates this phenomenon in the form of a plot of magnetization (J) versus applied field (Hex). Js is the saturation (or “spontaneous”) magnetization when all the magnetic moments are aligned in their configuration of maximum order. It is temperature-dependent, reaching zero at the Curie temperature. Jr,sat is the remanent magnetization that remains when a saturating (large) ...(100 of 7839 words)

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