Music by Eerik Kändler https://soundcloud.com/sumusumu
Biochar is a carbon-rich solid that is derived from biomass (organic matter from plants) that is heated in a limited oxygen environment. Biochar is intended for agricultural use, and is typically applied as a soil amendment, which is defined as any material that is added to soil to improve its physical properties, such as water and nutrient retention.
https://en.wikipedia.org/wiki/Biochar
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hrz4x4, 2019
