Description:

The correct answer is:

✅ Reflection of sunlight from snow

Why?

Snow reflects up to 80–90% of UV rays (compared to ~10–25% from grass or water), effectively doubling exposure.

This means UV hits your skin twice:

Directly from the sun.

Indirectly as it bounces off the snow.

Secondary Factors:

Altitude: At higher elevations (e.g., skiing), UV levels increase by 4–10% per 1,000 feet due to thinner atmosphere.

False Security: Cold temperatures trick people into skipping sunscreen.

Why Not the Others?

❌ Altered skin sensitivity: Cold doesn’t change UV vulnerability.

❌ Higher UV radiation levels: Only true at high altitudes or near the ozone hole—not the primary reason for most snowy-day sunburns.

Protection Tip: Wear SPF 30+ sunscreen and UV-blocking goggles (snow blindness is a risk too!). ⛷️☀️

Fun Fact: This effect is called the *"albedo effect." 🌨️🔆