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Silicon enters the ocean in a dissolved form such as silicic acid or silicate. [103] Since diatoms are one of the main users of these forms of silicon, they contribute greatly to the concentration of silicon throughout the ocean. Silicon forms a nutrient-like profile in the ocean due to the diatom productivity in shallow depths. [103]
In the deep ocean, another 26.2 Tmol Si Year −1 is dissolved before being deposited to the sediments as opal silica. [20] At the sediment water interface, over 90% of the silica is recycled and upwelled for use again in the photic zone. [20] Biogenic silica production in the photic zone is estimated to be 240 ± 40 Tmol si year −1. [36]
On April 25, 1977, the Japanese trawler Zuiyō Maru, fishing east of Christchurch, New Zealand, caught a strange, unknown creature in the trawl.The crew was convinced it was an unidentified animal, [4] but despite the potential biological significance of the curious discovery, the captain, Akira Tanaka, decided to dump the carcass into the ocean again so not to risk spoiling the fish caught.
Use of the compass for navigation in the Indian Ocean was first mentioned in 1232. [32]: 351–2 The first mention of use of the compass in Europe was in 1180. [32]: 382 The Europeans used a "dry" compass, with a needle on a pivot. The compass card was also a European invention. [32]
A joint alliance between the Korean Silla Kingdom and the Chinese Tang dynasty (618–907 AD) heavily defeated the Japanese and their Korean allies of Baekje in the Battle of Baekgang on August 27 to August 28 of the year 663 AD. This decisive victory expelled the Japanese force from Korea and allowed the Tang and Silla to conquer Goguryeo.
The earliest written sources of Old Japanese transcribe the name of the sea god in a diverse manner. The c. 712 CE Kojiki (tr. Basil Hall Chamberlain 1883) writes it semantically as 海 神 lit. "sea god" and transcribes it phonetically with man'yōgana as Wata-tsu-mi, 綿 津 見, lit. "cotton port see" in identifying Ōwatsumi kami and the Watatsumi Sanjin.
Berzelius is credited with discovering the chemical elements cerium and selenium and with being the first to isolate silicon, thorium, titanium and zirconium. Berzelius discovered cerium in 1803 [29] and selenium in 1817. [30] Berzelius also discovered how to isolate silicon in 1824, [31] and thorium in 1824.
The chemical elements were discovered in identified minerals and with the help of the identified elements the mineral crystal structure could be described. One milestone was the discovery of the geometrical law of crystallization by René Just Haüy , a further development of the work by Nicolas Steno and Jean-Baptiste L. Romé de l'Isle (the ...