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Vor 5 Tagen · Arsenic can occur in the environment in several oxidation states (−3, 0, +3 and +5), but in natural waters it is mostly found in inorganic forms as oxyanions of trivalent arsenite [As(III)] or pentavalent arsenate [As(V)]. Organic forms of arsenic are produced by biological activity, mostly in surface waters, but are rarely quantitatively important. Organic arsenic compounds may, however ...
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Vor 3 Tagen · Renewable energy (or green energy) is energy from renewable natural resources that are replenished on a human timescale. Using renewable energy technologies helps with climate change mitigation, energy security, and also has some economic benefits. [1] Commonly used renewable energy types include solar energy, wind power, hydropower, bioenergy ...
Vor einem Tag · Photo Courtesy of @Time. Founded by Tarana Burks in 2006 as a response to her own sexual assault, the #metoo hashtag became a symbol of a revolution. Victims of sexual violence came together, and shared these two words over 1.7 million times on Twitter and over 12 million times on Facebook, in over 85 countries.
Vor 2 Tagen · Chlorine. orthorhombic ( oS8) Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature.
Vor 2 Tagen · The meaning of WHEN IT COMES TO is —used to identify the specific topic that is being talked about. How to use when it comes to in a sentence.
Vor 4 Tagen · Small amounts of natural gold have been found in Spanish caves used during the late Paleolithic period, c. 40,000 BC. [80] The oldest gold artifacts in the world are from Bulgaria and are dating back to the 5th millennium BC (4,600 BC to 4,200 BC), such as those found in the Varna Necropolis near Lake Varna and the Black Sea coast, thought to be the earliest "well-dated" finding of gold ...
