| 词汇 | gypsum |
| 释义 | gypsum noun[ U ] uk /ˈdʒɪp.səm/ us /ˈdʒɪp.səm/ a hard, white substance that is used in making plaster of Paris石膏 Geology: types of rock agglomerate arenaceous arenite asthenosphere asthenospheric emery flinty gneiss haematite indurated intrusive lahar limestone lodestone magma marl marmoreal obsidian sandstone schist Examples of gypsumgypsum The sabkhas are covered by a salt crust, 3-5 cm thick, under which there lies 25-150 cm of carbonate sand, gypsum and halite. A few layers of gypsum-bearing mudstones occur in the western part. Moisture was monitored daily in each soil x moisture combination on four seedlings with gypsum blocks placed at 20 cm depth. Circles represent values less than 2%, except in the gypsum zone centered on 11 m, where circles signify only the presence of pollen types. Wave-ripple marks are commonly observed within this facies association, and gypsum occurs locally as discontinuous laminae. The minor internal dissolution of gypsum has an important consequence for the immediate habitat. Analysis of the photograph of the gypsum cast and the latex cast at hand indicates that the casts were made from the same specimen. However, gypsum is not always available, it is now very expensive and its application on groundnut may not be economical. Similar to that of the 1993 core, the profile contained gypsum bands that reflect periods of low lake level and, hence, dry climate. Interbedded shale and coal facies contain occasional desiccation cracks and locally gypsum crystals. The colour of the gypsum is normally greyish, and in-hand specimens of the gypsum contain large and clearly visible crystals. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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