All of the radio waves are reflected to the surface of the earth–

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by the ionosphere. Ionosphere is located above the Mesosphere. This layer begins at 80 km of distance from the earth surface. Some scientists believe it to be at the height of 500 km and some at an altitude of more than 1000 km. This circle is divided into several ionized layers, such as: D-Layer - Low frequency radio waves are reflected from this layer. E-Layer - Middle and high frequency radio waves are reflected by it on the earth surface. It is also known as Kennelly Heaviside layer. In this layer the North polar light (aurora borealis) and South polar light (aurora australis) are visible.

All of the radio waves are reflected to the surface of the earth–

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