| NOUN | location | E region, Heaviside layer, Kennelly-Heaviside layer, E layer | a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length |
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| Meaning | A region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length. | |
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| Synonyms | Heaviside layer, Kennelly-Heaviside layer, E layer | |
| Instance of | region, part | The extended spatial location of something |
| Part of | ionosphere | The outer region of the Earth's atmosphere |
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