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Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...
Description. Formed in Carboniferous / Permian limestone, the main Sơn Đoòng cave passage is the largest known cave passage in the world by volume – 3.84 × 10 7 m 3 (1.36 × 10 9 cu ft), according to BCRA expedition leader Howard Limbert. It is more than 5 kilometres (3.1 mi) long, 200 metres (660 ft) high and 150 metres (490 ft) wide.
Vietnam, [e][f] officially the Socialist Republic of Vietnam, [g] is a country at the eastern edge of mainland Southeast Asia, with an area of about 331,000 square kilometres (128,000 sq mi) and a population of over 100 million, making it the world's fifteenth-most populous country.
Từ điển bách khoa Việt Nam (lit: Encyclopaedic Dictionary of Vietnam) is a state-sponsored Vietnamese-language encyclopedia that was first published in 1995. It has four volumes consisting of 40,000 entries, the final of which was published in 2005. [1] The encyclopedia was republished in 2011. It is the first state encyclopedia of the ...
Coordinates: 11.2631°N 106.3339°E. The Michelin Rubber Plantation was a rubber plantation in Vietnam. It was located near Dầu Tiếng District in Bình Dương Province, 72 km northwest of Saigon. The plantation was established by the Michelin company in 1925 [1] and at 12,400 hectares (31,000 acres) it was the largest rubber plantation in ...
Artificial stone is a name for various synthetic stone products produced from the 18th century onward. Uses include statuary, architectural details, fencing and rails, building construction, civil engineering work, and industrial applications such as grindstones.
t. e. Vietnamese art is visual art that, whether ancient or modern, originated in or is practiced in Vietnam or by Vietnamese artists. Vietnamese art has a long and rich history, the earliest examples of which date back as far as the Stone Age around 8,000 BCE. [1]
The đàn tranh (Vietnamese: [ɗâːn ʈajŋ̟], 彈 箏) or đàn thập lục[1] is a plucked zither of Vietnam, based on the Chinese guzheng, from which are also derived the Japanese koto, the Korean gayageum and ajaeng, the Mongolian yatga, the Sundanese kacapi and the Kazakh jetigen. It has a long soundbox with the steel strings, movable ...
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