2018 10 21ensp;0183;ensp;Portland cement is the most common type of cement in general usage. It is a basic ingredient of concrete, mortar and many plasters.British masonry worker Joseph Aspdin patented Portland cement in 1824. It was named because of the similarity of its colour to Portland limestone, quarried from the English Isle of Portland and used extensively in London architecture.
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2018 10 26ensp;0183;ensp;Taapaca is a volcanic complex in northern Chile's Arica y Parinacota Region.It is part of the Central Volcanic Zone of the Andes, one of four distinct volcanic chains in South America.The town of Putre lies at the southwestern foot of the volcano. Like other volcanoes of the Central Volcanic Zone, Taapaca formed from the subduction of the Nazca Plate beneath the South America Plate.
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