Nearly all traces of the asteroids and comets that struck Earth billions of years ago have been erased from our planet's geologically active surface.

在地球上，所有数十亿年前被小行星和彗星撞击的痕迹，几乎都已经被地球表面的地质活动所抹去。

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The south of Junggar basin has complicated structure, many entrapments and active surface, all this indicates a large resource quantity.

准噶尔盆地南缘构造复杂，圈闭众多，油气苗显示活跃，资源量大。

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The south of Zhungeer basin has complicated structure, many entrapmentsand active surface indication, all this indicates a large resource quantity.

准噶尔盆地南缘构造复杂，圈闭众多，油气苗显示活跃，资源量大。

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It could also be used with a camera-based position detection system as shown above, meaning your finger's location and force could be calculated on a non-active surface like an ordinary table.

ENGADGET: Sony patent claims touch force detection via microphone

Whether the presence of acid conditions or surface active digestive substances in the guts of such marine organisms can desorb and release contaminants in significant quantities to cause such effects, or whether such a response is to their physical presence, remains to be answered.

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And it's believed that the high chemical reactivity of the surface is due to the deposition of chemically active gases from the atmosphere onto the surface, gases like hydrogen peroxide and ozone.

NPR: Revisiting the Viking Missions to Mars