Good soils fit in between the two extremes. A fluidized bed is a physical phenomenon that occurs when a solid particulate substance usually present in a holding vessel is under the right conditions so that it behaves like a fluidThe usual way to achieve a fluidize bed is to pump pressurized fluid into the particles.
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The resulting medium then has many properties and characteristics of normal fluids such as the ability to free-flow.
. Some soils resemble a large solid featureless massreferred to as massiveand have little or no structure. For example very sandy soils have no structure because sand grains do not cling together.
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