Soil: What It Is and What It Does
Explains that different kinds of soil are mixtures of sand, clay, and humus; tells how the weathering of rocks helps make soil; includes simple experiments to show the kind of soil in which different plants grow well.
Ključna riječ:
Soil: What It Is and What It Does 1966
soil science
soil
Coronet Instructional Films
Soil: What It Is and What It Does Online sa Prevodom
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