SciShow Tangents cover image

Crust with Ashley Roboto

SciShow Tangents

CHAPTER

How to Win Mineral of the Year

Bat Guano contains nitrogen, phosphorus and potassium. Historically, this crusty poop has been mined by humans to use as fertilizer or craft in a gunpowder. These poopy chemical reactions have created at least nine never before seen organic mineral crusts.

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