Decomposition is the process by which organic matter is broken down into simpler substances by microorganisms, such as bacteria and fungi.

Nematodes are not soil organisms, but rather small roundworms that live in soil and feed on other organisms.

Nitrogen fixation is the process by which nitrogen gas in the atmosphere is converted into a form that can be used by plants, such as nitrates and nitrites.

Earthworms do not directly reduce soil erosion, although they can contribute to improved soil structure, increased water infiltration, and enhanced nutrient cycling.

Humification is the process by which organic matter is converted into humus, a dark, organic-rich material that is an important component of soil.

There are only three main soil horizons: O horizon (organic matter), A horizon (topsoil), and B horizon (subsoil). The C horizon is the parent material from which the soil has formed.

Mineralization is the process by which nutrients are released from organic matter into a form that can be used by plants, such as nitrates, phosphates, and potassium.

Stony is not a type of soil texture. Soil texture refers to the relative proportions of sand, silt, and clay in a soil.

Denitrification is the process by which nitrogen gas is released from soil into the atmosphere, typically by bacteria under anaerobic conditions.

Spherical structure is not a type of soil structure. Soil structure refers to the arrangement of soil particles into aggregates.

Decomposition is the process by which organic matter is broken down into simpler substances, including carbon dioxide and water.

Pesticides are not soil amendments, but rather chemicals used to control pests in soil.

Nutrient uptake is the process by which nutrients are taken up by plant roots from the soil, typically in the form of ions.

Chemical erosion is not a type of soil erosion. Soil erosion refers to the wearing away of soil by natural forces, such as wind and water.

Soil formation is the process by which soil is formed from parent material, such as rock or sediment, through the action of weathering, erosion, and deposition.