가입하는 데 1 분도 걸리지 않으며 무제한 영화 및 TV 타이틀을 즐길 수 있습니다.
Soil: What It Is and What It Does 1966 무료 무제한 액세스
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.
실행 시간: 10 의사록
품질: HD
해제: Jan 01, 1966
국가: United States of America
언어:
예어 : soil science soil