What's the Dirt on ... Dirt?
Audrey Head
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:
www.sciencenews.org/blog/science-public/dirt-not-soil
urbanext.illinois.edu/soil/concepts/concepts.pdf
www.nrcs.usda.gov/wps/portal/nrcs/detail/national/home/?cid=nrcs143_021960
IMAGES:
commons.wikimedia.org/wiki/File:20060131_earthworm_hits_dirt.jpg