What are the four components of soil?

What are the four components of soil?

• A. Minerals, organic matter, water, and air.
• B. Sand, silt, clay, organic matter.
• C. Minerals, water, air, sunlight.
• D. Organic matter, water, air, rocks.

Answer: (A)

Soil is made up of four essential parts that determine its health and how well plants can grow: minerals, organic matter, water, and air. Minerals come from broken-down rock and provide the nutrients plants need to build tissues and carry out metabolism. Organic matter is decomposed plant and animal material that adds nutrients and helps soil hold together and retain water. Water fills the tiny spaces between soil particles and dissolves nutrients so roots can absorb them. Air sits in the other pore spaces and supplies oxygen for roots and soil organisms, which is just as important as water for healthy root function. The other options mix in things that aren’t considered components of soil in this sense. Sunlight isn’t part of the soil itself, rocks are larger materials not a basic component, and describing soil by texture (sand, silt, clay) refers to particle sizes rather than the four fundamental parts of soil.

Soil is made up of four essential parts that determine its health and how well plants can grow: minerals, organic matter, water, and air. Minerals come from broken-down rock and provide the nutrients plants need to build tissues and carry out metabolism. Organic matter is decomposed plant and animal material that adds nutrients and helps soil hold together and retain water. Water fills the tiny spaces between soil particles and dissolves nutrients so roots can absorb them. Air sits in the other pore spaces and supplies oxygen for roots and soil organisms, which is just as important as water for healthy root function.

The other options mix in things that aren’t considered components of soil in this sense. Sunlight isn’t part of the soil itself, rocks are larger materials not a basic component, and describing soil by texture (sand, silt, clay) refers to particle sizes rather than the four fundamental parts of soil.