My question is: how could this card game mechanic be adapted to examine properties of rock and soil? Factors of erosion? Uses in society? Hydrology? pH? Carbon/nitrogen content? etc.
Here's a link to a kid-friendly, US Department of Agriculture PDF looking at soils. ftp-fc.sc.egov.usda.gov It's 4.5 mb. If that link doesn't work, you can download it here. Choose sellsoil.pdf. http://www.mmnt.net/db/0/0/ftp-fc.sc.egov.usda.gov/NSSC/Educational_Resources