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是干燥的，但它们偶尔也会有大量的水流和沉积物。

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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.

石油和天然气的密度都比水小，所以二者通常会浮在被水浸泡的岩石和沉积物的表层。

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The iconic reef is being damaged by pesticides and sediment from farms that seep into waterways.

农业生产中各种杀虫剂和废渣都流入海水当中，大堡礁因此受到破坏。

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In all, the plutonium-powered, six-wheeled Curiosity carries 10 scientific instruments, including an analytical laboratory, to process mineral and sediment samples.

WSJ: NASA's Curiosity Rover Lands on Mars

As water moves through affected areas, it picks up both nutrients and sediment that would otherwise be held in the permafrost's icy grasp.

ECONOMIST: Global warming and the permafrost

The Antarctic Geological Drill (ANDRILL) team, as they're known, has just completed its second field-season here, retrieving an 1, 100-metre core of rock and sediment.

ECONOMIST: The South Pole as location and metaphor