A-class - Ah, right?

Japanese: A 層 - えーそう
A-class - Ah, right?

…The cross-sectional shape of soil is shown in Figure 1. (1) A layer The surface layer or layer close to the surface. This is the part most affected by the climate and the effects of plants, animals, and microorganisms. It is the layer where the remains of these organisms and their decomposition products accumulate. It is darker than other layers, and contains components absorbed from the lower layers by plant roots. …

*Some of the terminology that refers to the "A layer" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…図1に土壌の断面形態を示す。(1)A層 表層あるいは表面に近接した層。気候と動植物・微生物の作用をもっとも強く受けている部位で,これらの生物の遺体およびその分解生産物などの有機物が集積しており,他の層より黒みが強く,植物根によって下層から吸い上げられた成分も加わる。…

※「A 層」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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