• They found a unique layer of sediment worldwide.

    他们在世界各地发现了一独特沉积物

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  • Sediment sorting and compaction influence permeability and porosity.

    沉积物分选压实作用影响渗透率孔隙度

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  • They are found wherever fast rivers carrying loads of coarse sediment once flowed.

    携带大量泥沙湍急河流流经的任何地方,能找到它们

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  • The organic matter may partially decompose, using up the dissolved oxygen in the sediment.

    有机物可能会进行部分分解并耗尽沉积物中的溶解氧

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  • The crater, now deeply buried in sediment, was originally about 200 kilometers in diameter.

    这个陨石坑现在沉积物中,最初直径200公里

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  • They had found a prehistoric boat, preserved by the type of sediment in which it was buried.

    他们发现了一史前,这艘船依靠埋藏沉积物保存了下来

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  • Thus a proportion of the total volume of any sediment, loose or cemented, consists of empty space.

    因此无论是疏松胶结沉积物总体都有一部分空隙组成的。

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  • So sediment is transported and then deposited and it forms layers on the Earth's surface over time.

    所以沉积物运输,然后沉积随着时间的推移,地球表面形成

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  • Most desert streambeds are normally dry, but they occasionally receive large flows of water and sediment.

    大多数沙漠河床通常干燥的,它们偶尔也会大量水流沉积物

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  • Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions.

    石膏上方下方的沉积物中含有许多小型海洋生物化石,这表明这里的海洋环境很开放。

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  • The more poorly sorted or the more tightly compacted a sediment is, the lower its porosity and permeability.

    沉积物分选压实孔隙度渗透率越低

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  • These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment.

    这些海洋一个典型海底只不过这个海底公里厚沉积物覆盖。

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  • Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment.

    石油原油天然气组成,它们似乎来源于海洋沉积物中的有机物质

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  • The plant functions as a stabilizer and a sediment trap and as a nursery area for estuarine fish and shellfish.

    植物作为稳定剂沉积物集器,可以作为培育河口鱼类贝类地方

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  • When snorkeling, do not touch the coral or stir up sediment, as these actions can damage the reef's fragile ecosystem.

    潜泳的时候,不要珊瑚礁或者搅动沉淀物因为这样可能会破坏珊瑚脆弱生态系统

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  • Others point out that decreased sediment loads will likely lead to erosion of downstream riverbanks and the Mekong Delta.

    其他人指出泥沙负荷减少可能导致下游河岸湄公河三角洲的侵蚀

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  • Both oil and gas are less dense than water, so they generally tend to rise upward through water-saturated rock and sediment.

    石油天然气密度所以二者通常会浮在被水浸泡岩石和沉积物的表层。

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  • As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.

    作为地质学家我们研究地球表面沉积层估算过去地质时期的年代。

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  • Much of the water in a sample of water-saturated sediment or rock will drain from it if the sample is put in a suitable dry place.

    如果饱和沉积物岩石样品放在合适干燥地方,样品中的大部分从中流出

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  • Recent studies of sediment in the North Atlantic's deep waters reveal possible cyclical patterns in the history of Earth's climate.

    最近北大西洋深海沉积物研究揭示了地球气候历史上可能循环模式

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  • It was apparent that the glaciation occurred in the relatively recent past because the drift was soft, like freshly deposited sediment.

    明显冰川作用就发生相对不远的过去因为漂流物很新鲜沉积物

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  • Samples recovered from the expedition revealed important differences in chemical composition and fossil distribution among the sediment layers.

    探险队采集样品揭示了沉积物之间化学成分化石分布重大差异

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  • The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock.

    一样本包括曾经柔软硬化沉积物卵石深海淤泥以及石膏颗粒火山岩碎片

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  • The relative amount of these two kinds of water varies greatly from one kind of rock or sediment to another, even though their porosities may be the same.

    相对含量在不同岩石沉积物之间差异很大,尽管它们孔隙率可能相同的。

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  • An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.

    尤卡坦半岛上富含铱沉积层巨大陨石坑提供了证据,证明了约6500万年前,一颗大型陨石撞击了地球。

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  • This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.

    沉积层富含稀有金属以及其他陨石丰富地壳十分罕见元素

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  • Sediment as you know, is material like sand, gravel, fossil fragments that is transported by natural processes like wind, water flow or the movement of glaciers.

    所知沉积物通过水流冰川运动自然过程输送物质沙子砾石化石碎片等。

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  • Also, things like the damming of rivers has caused increased sediment production, not to mention the addition of more carbon dioxide and methane in the atmosphere.

    此外,河流筑坝等工程增加沉积物产量不用说大气二氧化碳甲烷增加

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  • This idea was modified in the late twentieth century, when geologists and oceanographers examining oceanic sediment found fossil evidence of warming and cooling of the oceans.

    20世纪后期地质学海洋学家在研究海洋沉积物发现了能够证明海洋变暖和化石,并修正一观点

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  • At certain times, apparently, more icebergs from the Arctic Ocean in the far north were traveling south well into the North Atlantic before melting and shedding their sediment.

    显然某些时候来自北冰洋最北端的更多冰山赶在融化沉积北大西洋

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