The soil under the humus is not dark. This lighter soil is rather like sand; it is made of bits of rock.
而腐殖土下面的土壤却不是黑色的，这种浅色的土壤很像沙子，它是由碎石变成的。
The soil under the humus is not dark. This lighter soil is rather like sand; it is made of bit of rock.
腐殖上下面的土壤并不黑，这种浅色土壤很像沙子，它是由碎石变成的。
This dark soil is humus, dead leaves, dead plants and animal waste make it, but this takes a long time.
一句所述，可推知这是一种由落叶、枯萎的植物以及动物的粪便在长时间的腐烂后所产生的一种东西。由此不难得出答案为。
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