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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.
Выпуск: Jan 01, 1966
Время выполнения: 10 минут
Язык:
Студия: Coronet Instructional Films
Страна: United States of America
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