Explanation:

- Option 1: Topsoil

- The uppermost layer of soil.

- Rich in minerals and organic matter.

- Crucial for plant growth.

- Option 2: Soil Particle

- Individual mineral grains.

- Forms the basic structure of soil.

- Includes sand, silt, and clay particles.

- Option 3: Soil Aggregate

- Clusters of soil particles.

- Binds together by organic matter.

- Enhances soil structure and porosity.

- Option 4: Pore Space

- Voids between soil particles.

- Contains air and moisture.

- Crucial for root growth and water movement.

- Option 5: Organic Matter

- Decayed plant and animal material.

- Improves soil fertility and structure.

- Enhances nutrient availability.