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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.
1. A repeated sound that is caused by the reflection of sound waves from a surface. The sound is heard more than once because of the time difference between the initial production of the sound waves and their return from the reflecting surface. 2. A reflected radio wave. Echoes of radio waves are the basis for radar.