Vall de Cardós (Catalan pronunciation: [ˈbaʎ ðe kaɾˈðos]) is a village in the province of Lleida and autonomous community of Catalonia, Spain. It is part of the province Pallars Sobirà and has a population of 375 (register office, 2024) 
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⭐ Core Definition: Vall de Cardós
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👉 Vall de Cardós in the context of County of Pallars
The County of Pallars or Pallás (Catalan: Comtat de Pallars, IPA: [kumˈtad də pəˈʎas]; Latin: Comitatus Pallariensis) was a de facto independent petty state, nominally within the Carolingian Empire and then West Francia during the ninth and tenth centuries, perhaps one of the Catalan counties, originally part of the Marca Hispanica in the ninth century. It was coterminous with the upper Noguera Pallaresa valley from the crest of the Pyrenees to the village of Tremp, comprising the Vall d'Àneu, Vall de Cardós, Vall Ferrera, the right bank of the Noguera Ribagorçana, and the valley of the Flamicell. It roughly corresponded with the historic region of Catalonia called Pallars. Its chief city was Sort.
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Vall de Cardós in the context of Metamorphic rock
Metamorphic rocks arise from the transformation of existing rock to new types of rock in a process called metamorphism. The original rock (protolith) is subjected to temperatures greater than 150 to 200 °C (300 to 400 °F) and, often, elevated pressure of 100 megapascals (1,000 bar) or more, causing profound physical or chemical changes. During this process, the rock remains mostly in the solid state, but gradually recrystallizes to a new texture or mineral composition. The protolith may be an igneous, sedimentary, or existing metamorphic rock.
Metamorphic rocks make up a large part of the Earth's crust and form 12% of the Earth's land surface. They are classified by their protolith, their chemical and mineral makeup, and their texture. They may be formed simply by being deeply buried beneath the Earth's surface, where they are subject to high temperatures and the great pressure of the rock layers above. They can also form from tectonic processes such as continental collisions, which cause horizontal pressure, friction, and distortion. Metamorphic rock can be formed locally when rock is heated by the intrusion of hot molten rock called magma from the Earth's interior. The study of metamorphic rocks (now exposed at the Earth's surface following erosion and uplift) provides information about the temperatures and pressures that occur at great depths within the Earth's crust.