Question

what is topsoil and A-horizons​

Answer 1

Answer:

the uper most layer of the earth crust is known as top soil .

it have many usefull minerals fertilizer which helps to greo of plants and plants help humans

Answer 2

Answer:

Humus and the smallest particles of rock form the upper layer of soil called topsoil or A-horizon. The presence of humus gives it a dark colour. It is the layer containing the most nutrients for plants. The root of most plants are confined to this layer. Humus makes this layer porous and fertile.

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