It depends on what you call useful, but probably topsoil because it holds nutrients necessary for growing plants.
The topsoil layer contains the most fertile soil. It is the upper layer of soil that is rich in organic matter, nutrients, and microorganisms, making it ideal for plant growth.
The layer of soil is called the topsoil, which is the uppermost layer of soil that contains most of the organic matter and nutrients that plants need to grow. It is typically the darkest and richest layer of soil, where most plant roots are found.
The top layer of soil is the most fertile layer. It is the best for growing crops.
Top soil
hummus is important for the soil because the nutrients in the hummus is useful for the soil.the soil will get the nutrients and the in the soil the roots will start to grow and then later a plant will grow.
The mantle layer contains the most silica. Silica is a major component of the minerals forming the mantle, such as olivine and pyroxene. This layer lies beneath the Earth's crust and extends to a depth of about 2,900 kilometers.
The layer that contains the most humus and smaller rocks is the topsoil layer. Topsoil is the uppermost layer of soil that is rich in organic matter, such as humus, and contains smaller rock particles that have undergone weathering. It is the most fertile layer of soil and is crucial for plant growth.
The top layer of soil, known as the topsoil, typically has the most biological activity due to its rich organic matter content and proximity to plant roots. This layer is where most of the soil's microbial life, such as bacteria, fungi, and insects, is concentrated, contributing to nutrient cycling and soil health.
topsoil.
The organic level which is the uppermost level of the soil.
The top layer of soil, called the topsoil, is closest to the surface. It is the layer that contains most of the organic matter and nutrients needed for plant growth.
The A horizon is the most important in forming soil as it contains organic matter and is the top layer where plant roots grow. This layer contributes to soil fertility and structure through the decomposition of organic material.