Wind as one of the important agents act on the earth surface landforms .

风是塑造地表形态的重要营力之一。

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Visitors to Iceland, for example, inhale the cleanest air on earth thanks to forests which act as natural air filters.

比如到冰岛旅游，就能呼吸到世界上最干净的空气，因为那里森林繁茂，是纯天然的空气净化器。

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Apparently earth was the only property that wasn't provokable, on the external level at least, but it would move when the wind property got into the act.

地似乎是唯一不可激发的元素，至少在外在层次，不过当风元素参与时，它也会移动。

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The report, Achieving and Sustaining Earth Observations: A Preliminary Plan Based on a Strategic Assessment by the U.S. Group on Earth Observations, was requested by Congress in the 2010 Consolidated Appropriations Act (Public Law 111-117).

WHITEHOUSE: Office of Science and Technology Policy Blog

Which raises the question, if the basics aren't there, why on earth do these giant cities continue to act as a magnet for such vast numbers of people?

BBC: Megacities face delicate balancing act