Kim Sun⚫⚪

This page lists questions and answers that were posted by visitors named Kim Sun⚫⚪.

Questions

The following questions were asked by visitors named Kim Sun⚫⚪.

Answers

The following answers were posted by visitors named Kim Sun⚫⚪.

I think it's A too because in the book I have it says its naturally occurring and they are formed by inorganic pieces/process