The texture of a soil is primarily determined by the relative proportions of sand, silt, and clay particles in the soil.

Calcium is an important plant nutrient, but it is not considered a primary nutrient like nitrogen, phosphorus, and potassium.

Percolation is the process by which water moves through the soil profile, from the surface to the groundwater.

All of the above are major sources of water pollution.

Transpiration is the process by which plants absorb water and nutrients from the soil through their roots and release water vapor into the atmosphere through their leaves.

Topsoil is the layer of soil that is most affected by human activities, such as agriculture and construction.

Sheet erosion is not a type of soil erosion. It is the process by which soil is removed from the land surface by wind or water.

Soil is formed from parent material through the processes of weathering, erosion, and deposition.

Loamy is not a type of soil texture. It is a term used to describe a soil that has a balanced mixture of sand, silt, and clay.

Evapotranspiration is the process by which water is removed from the soil by evaporation and transpiration.

Single-grained is not a type of soil structure. It is a term used to describe a soil that has individual soil particles that are not aggregated together.

The B horizon is the layer of soil that is located between the topsoil and the subsoil.

The O horizon is not a type of soil horizon. It is the layer of organic matter that is found on the surface of the soil.

Aeolian deposition is the process by which soil is deposited by wind.

Entisol is not a type of soil profile. It is a soil order that is characterized by the absence of distinct soil horizons.