What is a bone charcoal

Bone char is a porous, black, granular material produced by charring animal bones. Its composition varies depending on how it is made; however, it consists mainly of tricalcium phosphate 57–80%, calcium carbonate 6–10% and carbon 7–10%. It is primarily used for filtration and decolorisation.

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

< 3

the increase of protons   hope this