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1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
The function of the ozone layer is to shield the Earth from the harmful ultraviolet rays of the sun and to keep the Earth warm. The ozone layer is composed of ozone, a molecule made up of three oxygen atoms bonded together.