The manufacture of which of the following materials on a large scale is a cause of soil erosion ? A. Plastics B. Paper C. Polyester D. Plywood

Options

A. A and B
B. B and C
C. B and D
D. Only D

Answer

To determine which of the materials listed is a cause of soil erosion when manufactured on a large scale, we can analyze each option based on its relationship with deforestation and soil degradation.

### Step-by-Step Solution:

1. **Understand Soil Erosion**: Soil erosion refers to the removal of the top layer of soil, which is essential for plant growth. This often occurs due to deforestation, where trees are cut down, leading to the loss of soil stability.

2. **Analyze Each Option**:
- **A. Plastics**: The production of plastics does not directly cause soil erosion. Instead, it is more associated with soil pollution. Therefore, this option is not a cause of soil erosion.

- **B. Paper**: Paper is made from trees. The large-scale production of paper leads to deforestation, which can cause soil erosion as the protective layer of trees is removed. Thus, this option contributes to soil erosion.

- **C. Polyester**: Polyester is a synthetic material that is produced from petroleum products. Its production does not involve cutting down trees, so it does not contribute to soil erosion.

- **D. Plywood**: Plywood is made from thin layers of wood, which also requires cutting down trees. Similar to paper, large-scale plywood production can lead to deforestation and, consequently, soil erosion.

3. **Conclusion**: Based on the analysis, both paper (B) and plywood (D) are materials whose large-scale manufacture can lead to soil erosion due to deforestation. Therefore, the correct options are B and D.

### Final Answer:
B. Paper and D. Plywood are the materials whose large-scale manufacture causes soil erosion.

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