Drainage of the foundation pit formed the landing funnel of underground water which induce rocky surface collapse;

基坑排水形成地下水降落漏斗，诱发岩溶地面塌陷；

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This photo shows the Mars dry and rocky surface of Mars on the three cars covered with dust from the anti-pad in a depression.

此照片显示火星干燥且多岩石地表上的此火星车3个尘埃覆盖着的防陷垫中的一个。

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This artist's depiction shows a possible Earth-like planet with a rocky surface, oceans and an atmosphere. See more space tourism images.

模拟图描绘了类地行星，有岩石表面、海洋和大气。

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The severity of the laboratory test was equivalent to an oblique collision with the rocky surface of the Earth - a comet coming in at an angle of less than 25 degrees from the horizon, rather than head on (perpendicular to the Earth's surface).

BBC: Comets could have seeded life on Earth

How often the Universe has planets truly like the earth - true earth twins, planets the size of the earth, rocky planets with a surface that supports liquid water - well, we don't have that number yet, but I'm optimistic we'll figure it out.

BBC: From counting to characterising exoplanets

Hidden 1, 000 feet beneath the surface of the Rocky Mountains lies the largest untapped oil reserve in the world.

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