Stratum, · In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil, or igneous rock that was formed at the Earth's surface, with internally consistent characteristics that distinguish it from other layers. The "stratum" is the fundamental unit in a stratigraphic column and forms the basis of the study of ...Blue laser, · A blue laser is a laser that emits electromagnetic radiation with a wavelength between 360 and 480 nanometers, which the human eye sees as blue or violet. Blue beams are produced by helium-cadmium gas lasers at 441.6 nm, and argon-ion lasers at 458 and 488 nm. Semiconductor lasers with blue beams are typically based on gallium(III) nitride ...In land of big data, China sets individual privacy rights, · China is poised to enshrine individuals' rights to privacy and personal data for the first time, a symbolic first step as more of the country of 1.4 billion people becomes digitised - and more vulnerable to leaks and hacks. The legislation is part of China's firstBlack and Blue (2019), · Directed by Deon Taylor. With Naomie Harris, Tyrese Gibson, Frank Grillo, Mike Colter. A rookie New Orleans police officer is forced to balance her identity as a black woman after she witnesses two corrupt cops committing murder.Where Things Come From: Rock Materials, · Crushed stone in a gravel quarry; Geology Guide photo Crushed stone is manufactured aggregate, an essential material for building roads (mixed with asphalt), constructing foundations and railbeds (road metal) and making concrete (mixed with cement )..
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