Why is the topsoil horizon always darker than the other layers? *
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Ответ:
Topsoils are dark primarily because they contain dead organic material in various stages of decomposition. ... The degradation of organic matter within the soil produces a substance called humus, which has a complex chemical structure and is composed of carbon-rich compounds that impart the dark color.
Explanation:
Ответ:
I'm pretty sure it's the topsoil.
Explanation: