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Soil is the material that covers land. Soils consist of a mixture
of different things, such as:
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Sand - sediment consisting of
mineral particles (mainly quartz) which covers parts of the
sea-shore, river beds and deserts.
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Silt - sediment consisting of
mineral particles smaller than sand.
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Clay - sediment consisting of
very small mineral particles. It is a stiff paste-like material
used in pottery.
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Dust - minute particles light
enough to be carried by the wind.
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Humus - dark-coloured material
which comes from decomposed plants.
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Peat - dead, partly decomposed
plant material which accumulates in layers.
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