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Leather is a porous material made from the skin of an animal. Being in a marine environment leather can deteriorate over time. The water-soluble material such as tannins, fats and oils, components part of leather, can dissolve in a marine environment as a result of the collagen's fiber that is susceptible to hydrolysis.
Cellars and basements built into soils over granite can become a trap for radon gas, [58] which is formed by the decay of uranium. [59] Radon gas poses significant health concerns and is the number two cause of lung cancer in the US behind smoking. [60] Thorium occurs in all granites. [61]
Decomposed granite is a kind of granite rock that is weathered to the point that the parent material readily fractures into smaller pieces of weaker rock. Further weathering yields material that easily crumbles into mixtures of gravel -sized particles known as grus that further may break down to produce a mixture of clay and silica sand or silt ...
Cracking and curling can be reduced by dividing the area to be covered into smaller sections and then pouring the material. [5] Debonding of the granolithic material can also be significantly avoided by using bonding agents like epoxy resins or polymer latex. A high degree of skill in pouring and finishing the material is needed to prevent ...
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.
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