The sun is essential to life. Without the sun, then there is no life on earth. The sun contributes to the process of photosynthesis in plants. In addition, the sun also acts to stimulate the body to produce vitamin D, which serves to metabolize calcium, thus forming strong bones.
Sunlight, if a little is beneficial to the body. However, excessive sun can be harmful to the skin. Even the hazard can increase with the number of rays on the skin. Why?
The sun produces radiation that reaches the earth’s surface. Solar radiation is composed of infrared and visible light and ultraviolet light within a radius of A and B (UVA and UVB). Fortunately, the atmosphere absorbs cosmic rays, gamma rays and X-ray beam produced by the sun. In addition, the ozone layer in the atmosphere also inhibits ultraviolet radiation C (UVC) and filter out most of the UVA and UVB. Unfortunately, the ozone layer is being damaged at various places so that the ultraviolet radiation is often called UV increasing lately.
Ultraviolet or UV radiation can cause skin damage, even permanent skin damage including skin cancer. Ultraviolet radiation (UV) can cause your skin to burn, and cause brown spots and thickening and dryness of skin. UV radiation can damage DNA, suppress immune system, and activate the chemicals in the body that can cause cancer. Other negative effects of premature aging. Even later revealed that UVA radiation penetrates the skin deeper than UVB, which can cause skin cancer, and may suppress the immune system.
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