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Glass is formed by the cooling of a rock magma too rapidly for this structural
regularity to become established. Glasses typically are not stable at low
temperatures, however, and a readjustment of the atomic arrangement may take
place to form ...
Some diorites are truly igneous; they have crystallized from molten material (
magma). Others represent the products of reaction between magma and included
fragments of foreign rock. Many have been chemically transformed in the solid
Most such third- and fourth-order topographic features were formed as a result of
vertical tectonic movements (i.e., uplift and subsidence of the Earth's crust) and
the extrusion of molten-rock material called magma. Continental landforms of ...
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The New Encyclopaedia Britannica (Encyclopaedia)User Review - Not Available - Book Verdict
For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review