Major source of formation of soil is

Options

A. rocks
B. snow covered mountains
C. rivers beds
D. volcanoes

Explanation

**Step-by-Step Solution:**

1. **Understanding Soil Formation**: Soil is the uppermost layer of the Earth, essential for plant growth and providing habitat for various organisms.

2. **Identifying the Major Source**: The major source of soil formation is rocks. Soil is primarily formed through the weathering of rocks.

3. **The Weathering Process**: Weathering is the process where rocks break down into smaller particles due to natural conditions like wind, water, and temperature changes.

4. **Types of Soil Particles**: As rocks weather, they break down into different sizes of particles. Larger particles form sand, while smaller particles can form clay.

5. **Conclusion**: The correct answer to the question "Major source of formation of soil is" is rocks.

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