Rock (geology)
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In geology, rock is a naturally occurring solid aggregate of minerals and/or mineraloids.
The Earth's outer solid layer, the lithosphere, is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic. The scientific study of rocks is called petrology, and petrology is an essential component of geology.
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Rocks in art
- rocks in art[1]
- Allegory of Chastity by Memling
- Agony in the Garden (Bellini) by Giovanni Bellini
- Agony in the Garden (Mantegna) by Mantegna
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Rock formations
This is a List of rock formations, meaning isolated, scenic, or spectacular surface rock outcrops. These are usually the result of weathering and erosion sculpting the existing rock. Rock formation in general refers to specific sedimentary strata or other rock unit in stratigraphic and petrologic studies.
A rock structure can be created in any rock type or combination:
- Sedimentary rocks are created from bits of rocks that have broken off other rocks by wind or water erosion, and deposited by wind, ice, or water. Erosion later exposes them in their current form. An example is Bryce Canyon National Park in Utah.
- Metamorphic rocks are created by rocks that have evolved into another kind of rock, usually by heat and pressure. An example are the Seneca Rocks in West Virginia.
- Igneous rocks are created when molten rock cools and solidifies, with or without crystallization. They may be either plutonic bodies or volcanic extrusives. Again, erosive forces sculpt their current forms. An example is Half Dome in Yosemite National Park.
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See also
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Rock (geology)" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
