-------part is composed for Organic matter mixed with mineral matter
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The topsoil part is composed of Organic matter mixed with mineral matter.
Soil has many layers. The topsoil is the layer of the soil that lies at the very top. Generally, the width of topsoil extends up to 5-10 inches or 13-25 cm. This is the layer where the plants have their roots.
It is very good for plants as it has the capacity of retaining moisture. This means when watered, this soil can hold the moisture in it and thus is beneficial for plants.
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