Explain the following:
People on top of mountains have a higher risk of sun burns.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Environment at High Altitudes:**
- At higher altitudes, such as the top of mountains, the atmospheric pressure is lower compared to sea level. This means there is less air above to absorb and scatter the sun's rays.

2. **Effects of Reduced Atmospheric Protection:**
- The atmosphere acts as a protective layer that filters out some of the harmful ultraviolet (UV) radiation from the sun. With less atmosphere at high altitudes, there is reduced filtration of UV rays.

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