| 单词 |
hammada |
| 释义 |
hammada Geol.|hæˈmɑːdə|
Also hamada(h).
[f. Arab. ḥammāda.]
A flat rocky area of desert blown free of sand by the wind, typical of the Sahara.
1853J. Richardson Narr. Mission Cent. Afr. II. iv. 60 Aghadez is situated on a hamadah, or lofty plateau of sandstone and granite formation. 1857H. Barth Trav. N. & Cent. Afr. I. v. 133 Overweg and I had no time to lose in preparing for our journey over the hammáda, or plateau. 1886Encycl. Brit. XXI. 149/2 Nearly all the rest of the Sahara consists..of undulating surfaces of rock (distinguished as hammada),..and regions of sandy dunes. 1934W. Fitzgerald Africa i. ii. 60 Rocky wastes with the bare exposure of fissured rocks as dominant features of the scene, form the ‘hamada’ type of the Sahara. 1966McGraw-Hill Encycl. Sci. & Technol. IV. 76/2 Ordinarily, a hammada is a bare rock surface composed of relatively flat-lying consolidated sedimentary rocks from which overlying softer sediments have been stripped, principally by wind erosion. |
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