Biogenic silica | Wikipedia audio article
Channel: wikipedia tts
Date: 27/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Biogenic_silica


00:00:46 1 Silica in marine environments
00:07:43 1.1 Marine biogenic silica budget
00:09:50 1.2 Major silica sinks in the modern oceans
00:12:43 1.3 Cycling and accumulation of biogenic silica in the Southern Ocean sediments
00:13:46 1.4 BSi production
00:15:17 1.5 BSi dissolution
00:15:52 1.6 BSi preservation
00:16:49 2 Opaline silica on Mars



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SUMMARY
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Biogenic silica (bSi), also referred to as opal, biogenic opal, or amorphous opaline silica, forms one of the most widespread biogenic minerals. For example, microscopic particles of silica called phytoliths can be found in grasses and other plants. Silica is an amorphous metal oxide formed by complex inorganic polymerization processes. This is opposed to the other major biogenic minerals, comprising carbonate and phosphate, which occur in nature as crystalline iono-covalent solids (e.g. salts) whose precipitation is dictated by solubility equilibria. Chemically, bSi is hydrated silica (SiO2·nH2O), which is essential to many plants and animals.