What's The Dirt On ... Dirt?

A SciShow Kids viewer has asked us: What is dirt made of? Join Jessi to get the dirt on … dirt!

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SOURCES:
https://www.sciencenews.org/blog/science-public/dirt-not-soil
http://urbanext.illinois.edu/soil/concepts/concepts.pdf
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/national/home/?cid=nrcs143_021960

IMAGES:
https://commons.wikimedia.org/wiki/File:20060131_earthworm_hits_dirt.jpg
https://ThinkStockPhotos.com