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Topsoil is the horizon in Figure 7-1.

User OBWANDO
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Topsoil is the A horizon in figure 7-1.The most leaching of minerals occurs from the A horizon into the B horizon. The C horizon shown in figure 7-1 is most like the parent soil, and the A horizon in figure 7-1 contains the most humus.
User Dwight Reynoldson
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