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To take a bit of a break from life and natural history, we talk about geology, which is part of natural history, and life, which is part of life. Specifically we talk about rocks that are formed by life.
Here’s a link to a video about the link between rocks, minerals, and the evolution of life.
Here’s a link about coal
Here’s a link about chalk
What is chalk and how does it form?
Here are several links about gold and bacteria.
Cupriavidus metallidurans: A Modern Alchemist