Explain why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?

Explanation

To explain why the surface of a mortar and pestle (silbatta) is etched again after prolonged use, we can break down the reasoning into several steps:

### Step-by-Step Solution:

1. **Understanding the Function of Mortar and Pestle**:
- The mortar and pestle are used for grinding substances, such as spices or herbs. The rough surface of the mortar and pestle helps in effectively crushing and grinding materials.

2. **Effect of Prolonged Use**:
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