The most important natural resource is the sun's ultraviolet. most of the ultraviolet rays emitted by the sun never reaches the earth's surface, because if too much is up to the surface of the earth / penetrate the earth's atmosphere will ruin the lives of living beings on earth. prior to ultraviolet rays penetrate the Earth's atmosphere was blocked first by the gas called ozone layer and is located much higher than the earth's atmosphere.
harmful effects
we can not see ultraviolet light, but can feel the effect or effects. too much ultraviolet can endanger our health. exposed skin blistering heat will produce higher levels of melanin. this is what berpungsi melanin protects the skin from sun burn
beneficial effects
in addition to harmful, ultraviolet rays are also useful. we all need ultraviolet light to illuminate our skin can make vitamin D. Vitamin D is necessary for bone and teeth to grow healthy
