Understanding Our Earth - Soil (Rev)
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An explanation of the soil profile (topsoil, subsoil, mantle rock, and bedrock), plus a breakdown of the elements of soil. The process of soil formation is shown -- rocks breaking down by erosion and decaying matter changing into humus. Types of soil throughout the U.S. and conservation are other points discussed.
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- 16mm Filmography (legacy record) — title, creator, format, sound, genre, description, catalog record
Original permalink · Record added 2023-02-27 16:38:09