They are very weakly interacting, which means that they can pass through solid earth unimpeded.

它们之间的相互作用非常弱，这意味着它们能畅通无阻地穿过坚固的土地。

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Since life began it has continually shaped and re-shaped the atmosphere, hydrosphere, cryosphere and the solid earth.

自从生命出现以来，生物便不断一而再再而三的改造大气圈、水圈、冰圈及固体地球。

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Key points: layers of solid earth and its features. Uniformitarianism.

重点：固体地质圈层划分及其特征、将今论古说。

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It was my teacher. I held her with all my strength then shook with joy to feel the solid earth under my feet."

VOA: special.2009.11.15

The first pictures of Earth taken from space showed a solid ball covered by brown and green landmasses and blue-green oceans.

VOA: special.2011.01.04

Only 28% of respondents 65 and over thought there was solid evidence the earth was warming because of human activity, versus 42% overall.

WSJ: On Climate Change, Some Arguments Shift

And the earth's solid surface can be made to stand in for that of other planets, too.

ECONOMIST: Planetary pretenders

But, mumble Mr Galbraith's opponents, why on earth should a solid citizen from Charlestown or Chelsea cast a vote for such a man?

ECONOMIST: Peter Galbraith��s smaller stage