【多选题】土壤形成因素学说的主要内容有( )。
A.
土壤是母质、气候、生物、地形和时间等5种自然成土因素综合作用的产物
C.
随着成土因素的变化,土壤也随着不断地形成和演化着
D.
由于成土因素存在着地理分布规律,所以土壤也具有一定的地理分布规律。
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