It used in straitness field, soft earth layer and instability aquiclude.

主要适用于场地狭窄、软弱土层和不稳定含水土层中的施工。

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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的沉积层和一个巨大的陨石坑提供了证据，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.

这一沉积层富含稀有金属铱，以及其他在陨石中较丰富而在地壳中十分罕见的元素。

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The data, from NASA's TIMED mission, show that Earth's thermosphere (the layer above 62 miles or 100 km above the Earth's surface) "responds quite dramatically to the effects of the 11-year solar cycle, " Stan Solomon of the National Center for Atmospheric Research in Boulder, Colo.

MSN: Earth's upper atmosphere cooling dramatically

Many old fridges contain chemicals called Chlorofluorocarbons (CFCs) which damage the Earth's ozone layer.

BBC: Ghana bans second-hand fridges

When the sun is relatively inactive as it has been in recent years the outermost layer of Earth's atmosphere cools dramatically, new observations find.

MSN: Earth's upper atmosphere cooling dramatically