Rock (geology)
Rocks (disambiguation)|and|Stone (disambiguation)|and|Stones (disambiguation)}}In geology, rock (or stone) is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition, and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere. The study of rocks involves multiple subdisciplines of geology, including petrology and mineralogy. It may be limited to rocks found on Earth, or it may include planetary geology that studies the rocks of other celestial objects.
Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis and lithification of sediments, which in turn are formed by the weathering, transport, and deposition of existing rocks. Metamorphic rocks are formed when existing rocks are subjected to such high pressures and temperatures that they are transformed without significant melting.
Humanity has made use of rocks since the earliest humans. This early period, called the Stone Age, saw the development of many stone tools. Stone was then used as a major component in the construction of buildings and early infrastructure. Mining developed to extract rocks from the Earth and obtain the minerals within them, including metals. Modern technology has allowed the development of new human-made rocks and rock-like substances, such as concrete. Provided by Wikipedia
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Zwart-wit foto van Edward Anseele sr. uit de fotoreportage ' 5 minuten met Edward Anseele', Gent, oktober 1932. ...
By Stone
Date 1932-1932
Date 1932-1932
fotografische afdruk
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Zwart-witfoto van Edward Anseele sr. uit de fotoreportage ' 5 minuten met Edward Anseele', Gent, oktober 1932. By Stone
Date 1932-1932
Date 1932-1932
fotografische afdruk
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Affiche van Cami Stone uitgegeven in 1938 door Parti Socialiste Belge (PSB) voor de gemeenteraadsverkiezingen. Afbeelding: zwart-witfoto van een jonge ...
By Stone, Cami, Éditions Labor, PSB
Date 1938
Date 1938
affiche
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Affiche van Stone uitgegeven in 1932 door de Belgische Werkliedenpartij (BWP) Gent voor de gemeenteraadsverkiezingen. Tekst: De socialisten deden 724 ...
By Stone, BWP-afdeling Gent
Date 1932-1932
Date 1932-1932
affiche
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Zwart-witfoto van Hippoliet Vandemeulebroucke, socialistisch volksvertegenwoordiger voor Oostende. Portret, 13 februari 1933. ...
By Stone
Date 1933-02-13
Date 1933-02-13
fotografische afdruk
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Zwart-witfoto, portret van Edward Anseele sr. "5 minuten met Edward Anseele" By Stone, Cami
Date 1930-1935
Date 1930-1935
fotografische afdruk
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Zwart-witfoto van François Gelders. Portret, jaren 1930. By Stone
Date 1930-1939
Date 1930-1939
fotografische afdruk
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Zwart-witfoto, Edward Anseele sr. wrijft met een zakdoek zijn mond schoon. Op de achtergrond staat Paul-Gustave Van Hecke, 1935. "5 ...
By Stone
Date 1935
Date 1935
fotografische afdruk
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Zwart-witfoto van vakbondsleider Mathieu Duchesne, jaren 1930. Portret. By Stone
Date 1930-1939
Date 1930-1939
fotografische afdruk
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