Word | Noun | Adjective | Verb | Adverb |
---|---|---|---|---|
ionosphere | Yes | No | No | No |
D-layer | Yes | No | No | No |
ionosphere (noun) | D-layer (noun) |
---|---|
the outer region of the Earth's atmosphere; contains a high concentration of free electrons | the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves |