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Soil
The earth mantle is made of decomposed rock and decayed organic material.
Tag: Soil
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Subsidence
The settling of land by the compression of lower layers of rock and soil, usually accelerated by the removal of water from below the surface. Of particular importance in urban centers, with Mexico City having one of the most persistent problems.
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Swidden
A cycle of land use between crop and fallow years is needed to work around the infertility of tropical soils.