A man digging a pit found that he could dig with ease initially but digging became difficult as he went deeper. He could not dig beyond a depth of 5 feet. Provide a suitable scientific explanation.

Explanation

### Step-by-Step Solution:

1. **Understanding Soil Layers**: The soil is composed of different layers, each with distinct characteristics. The top layer, known as the O horizon, is rich in organic matter and is usually softer and easier to dig.

2. **Characteristics of Upper Soil**: The upper layers of soil (O and A horizons) are generally more fertile and contain more moisture. This moisture makes the soil loose and easier to work with, allowing the man to dig with ease initially.

3. **Deeper Soil Layers**: As the man digs deeper, he encounters lower layers of soil (B and C horizons). These layers are denser and often contain more minerals and less organic matter, making them harder and more compact.

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