| 单词 | D layer |
| 释义 | D layer [`dē ´lā·ǝr] GEOLOGY The lower mantle of the earth, between a depth of 600 and 1800 miles (1000 and 2900 kilometers). GEOPHYSICS The lowest layer of ionized air above the earth, occurring in the D region only in the daytime hemisphere; reflects frequencies below about 50 kilohertz and partially absorbs higher-frequency waves. |
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