In order to make fertile soil, the tiny rock particles should be mixed with

Options

A. clay
B. silt
C. humus
D. sand

Answer

To answer the question "In order to make fertile soil, the tiny rock particles should be mixed with," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Components of Soil**: Understand that soil is composed of various components, including tiny rock particles, organic matter, water, and air.

2. **Define Humus**: Recognize that humus is the uppermost layer of soil, which is rich in organic matter. It is formed from the decomposition of dead plants and animals.

3. **Importance of Humus**: Acknowledge that humus is crucial for soil fertility as it contains essential nutrients that support plant growth. It also provides a habitat for microorganisms and earthworms, which further enhance soil quality.

4. **Mixing Tiny Rock Particles**: Conclude that to create fertile soil, tiny rock particles (minerals) should be mixed with humus. This combination improves soil structure, nutrient content, and microbial activity.

5. **Final Answer**: Therefore, the tiny rock particles should be mixed with humus to make fertile soil.