Archive for August, 2011
The sun is essential for life. Without the sun, then there is no life on earth. The sun plays a role in the process of photosynthesis in plants. In addition, Sun also serves to stimulate the body to produce vitamin D, which serves to metabolize calcium in the body, thus forming strong bones.
Sunlight, if a little is beneficial to the body. However, excessive sun can harm the skin. Even the hazard can increase with increasing number of rays on the skin. Why?
The sun produces rays of radiation that can reach the earth’s surface. Radiation is composed of infrared rays and visible light and ultraviolet light within a radius of A and B or often called UVA and UVB. Fortunately, the atmosphere can absorb 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 filters out most UVA and UVB. Unfortunately, the ozone layer is being damaged at various places so that ultraviolet radiation is often called UV increased lately.