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Gypsum is a common mineral, with thick and extensive evaporite beds in association with sedimentary rocks. Deposits are known to occur in strata from as far back as the Archaean eon. [16] Gypsum is deposited from lake and sea water, as well as in hot springs, from volcanic vapors, and sulfate solutions in veins.
Gypsum precipitates are formed in individual areas. In general, the deposits can be traced back to a coastal sea. In the outcrops to the north of Lake Qarun, they appear as a uniform sedimentary complex, which fans out to the west towards the Wadi el-Hitan and interlocks with the Gehannam Formation in its lower and middle sections.
It is mainly composed of gypsum (CaSO 4 ·2H 2 O). Although gypsum is a widely used material in the construction industry , phosphogypsum is usually not used, but is stored indefinitely because of its weak radioactivity caused by the presence of naturally occurring uranium (U) and thorium (Th), and their daughter isotopes radium (Ra), radon (Rn ...
DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are biomolecular cousins that are fundamental molecules in cell biology. DNA contains an organism's genetic code.
In the geologic record, the K–Pg event is marked by a thin layer of sediment called the K–Pg boundary or K–T boundary, which can be found throughout the world in marine and terrestrial rocks. The boundary clay shows unusually high levels of the metal iridium , [ 5 ] [ 6 ] [ 7 ] which is more common in asteroids than in the Earth's crust .
The drug, called Journavx (suzetrigine) and manufactured by biotech company Vertex Pharmaceuticals, is a non-opioid painkiller, which doesn’t have addictive properties, unlike opioids often used ...
Tissue (biology), a cellular organizational level intermediate between cells and a complete organ; Viable material, capable of living, developing, or germinating under favorable conditions (see Viability selection)
A rising singer named Madonna filmed her movie debut in 1983 and then became a global superstar before the 1985 release of "Vision Quest," which celebrates its 40th anniversary.