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Soil: What It Is and What It Does 1966 Mynediad Diderfyn Am Ddim
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.
Amser Cinio: 10 munudau
Ansawdd: HD
Rhyddhau: Jan 01, 1966
Gwlad: United States of America
Iaith:
Allweddair : soil science soil