Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
ionosphere | Yes | No | No | No |
Appleton layer | Yes | No | No | No |
ionosphere (noun) | Appleton layer (noun) |
---|---|
the outer region of the Earth's atmosphere; contains a high concentration of free electrons | the highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission |