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The ozone layer is a layer of gas molecules which is bombarded with rays from the sun. These are harmful UV rays and this ozone layer in present in the stratosphere.he photosphere is the visible part of the Sun's atmosphere. The parts of the sun's atmosphere from the surface outward are the photosphere, the chromosphere, the corona, and the outer layers of the corona called the solar wind.
UV-A is the least damaging (longest wavelength) form of UV radiation and reaches the Earth in greatest quantity. Most UV-A rays pass right through the ozone layer in the stratosphere. UV-B radiation can be very harmful. Fortunately, most of the sun's UV-B radiation is absorbed by ozone in the stratosphere. UV-C radiation is potentially the most damaging because it is very energetic. Fortunately, all UV-C is absorbed by oxygen and ozone in the stratosphere and never reaches the Earth's surface.