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Soil: What It Is and What It Does 1966 Akses tanpa had percuma
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.
Masa Jalan: 10 minit
Kualiti: HD
Lepaskan: Jan 01, 1966
Negara: United States of America
Bahasa:
Kata kunci : soil science soil