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Mining of sulfur from a deposit at the edge of Ijen's crater lake, Indonesia. Mining is the extraction of valuable geological materials and minerals from the surface of the Earth. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.
Salar de Uyuni (or "Salar de Tunupa") [1] is the world's largest salt flat, or playa, at 10,582 square kilometres (4,086 sq mi) in area. [2] [3] It is in the Daniel Campos Province in Potosí in southwest Bolivia, near the crest of the Andes at an elevation of 3,656 m (11,995 ft) above sea level.
Flowchart of using successive subtractions to find the greatest common divisor of number r and s. In mathematics and computer science, an algorithm (/ ˈ æ l ɡ ə r ɪ ð əm / ⓘ) is a finite sequence of mathematically rigorous instructions, typically used to solve a class of specific problems or to perform a computation. [1]
Early blockchains rely on energy-intensive mining nodes to validate transactions, [29] add them to the block they are building, and then broadcast the completed block to other nodes. [32]: ch. 08 Blockchains use various time-stamping schemes, such as proof-of-work, to serialize changes. [43] Later consensus methods include proof of stake. [29]
The ancient Sumerians of Mesopotamia were the oldest civilization in the world, beginning about 4000 BCE. Ancient Egypt is an example of an early culture civilization. [1]A civilization (also spelled civilisation in British English) is any complex society characterized by the development of the state, social stratification, urbanization, and symbolic systems of communication beyond signed or ...
This author was recognized as authority by the International Code of Zoological Nomenclature in 1999. [ 1 ] Elephas ( Loxodonta ) cyclotis was proposed by Paul Matschie in 1900, who described three African elephant zoological specimens from Cameroon whose skulls differed in shape from those of elephant skulls collected elsewhere in Africa. [ 5 ]
Nigeria's most expansive topographical region is that of the valleys of the Niger and Benue river valleys (which merge and form a Y-shape). [104] To the southwest of the Niger is a "rugged" highland. To the southeast of the Benue are hills and mountains, which form the Mambilla Plateau, the highest plateau in Nigeria.