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     Oxidation and Reduction

Dr. Dirt explains how the charge of 
soil affects a variety of soil characteristics.


     Particle Density

Dr. Dirt explains how the variability
of particle density.



    Calculating Particle Density

Ever want to learn how to calculate the particle density
of a soil? Find out here. 

     Fruit or Vegetable?

Learn the difference between
fruits and vegetables. 

     The Importance of Soil

Dr. Dirt explains the importance of soil
throughout history.

     What is Weathering?

Chemical and physical weathering is
demonstrated using crackers.