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How Are Soils Classified?
Source Institutions
    
  In this activity about soil (page 7 of the PDF), learners will use their sense of touch as well as sight to understand how soil is classified based on texture and other details.
  
Size and Scale: Probing and Predicting
Source Institutions
    
  In this quick activity about predicting (located on page 2 of the PDF under Where's Nano?