Which of the following is false regarding UVA rays?

UVA rays are known for their ability to penetrate the skin deeply, affecting the dermis where collagen and elastin are found, which contributes to skin aging and the development of wrinkles and sunspots. While UVA rays are indeed less intense than UVB rays in terms of immediate intensity, they are more prevalent and can cause long-term damage, including the risk of cancer. Sunscreens are formulated to protect against UV radiation, but not all sunscreens provide complete protection against UVA rays; therefore, the statement about them being completely blocked by sunscreen is false.

Understanding this helps in making informed choices about sun protection and recognizing the importance of broad-spectrum sunscreens that protect against both UVA and UVB rays, as well as the necessity of reapplying sunscreen frequently for effective protection.