Underground water does not contain suspended impurities. Why?

Explanation

**Step-by-Step Solution:**

1. **Understanding Underground Water**: Underground water refers to water that is found beneath the Earth's surface, often stored in aquifers.

2. **Seepage Process**: When rainwater or surface water seeps into the ground, it moves through various layers of soil, sand, gravel, and rock. This process is known as seepage.

3. **Filtration through Soil and Rock**: As the water seeps down, it passes through porous materials such as sand and gravel. These materials have tiny spaces (pores) that allow water to flow through while trapping larger particles and impurities.

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