Scientists Speculate that the amount of radon increases in the ground when rocks layers shift, Exposing new rock, and thus more radon.

科学家们认为，当岩层移动时，地下氡的的含量就会增加；有新岩层露出时。氡气量会增加更多。

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Scientists speculate that the amount of radon increases in the ground when rocks layers shift., exposing new rock, and thus more radon.

科学家推测当岩层移位时，新岩石露出，产生更多的氡，这样地层中的氡的数量就增加了。

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The builders covered it with an erosion-resistant cloth, then stacked layers of rocks on the sand.

接着建筑工人用抗腐蚀材料将沙土基座覆盖起来，再往上堆砌岩石层。

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Rocks initially formed as layers of sediment laid down in an ancient sea can be deciphered by knowing that older layers are found beneath the younger layers.

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Natural gas formations are thousands of feet below drinking water aquifers so for contamination to occur the fracking solution would have to move through multiple layers of rocks.

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That there are not could be explained by the fact that the accumulation of sediment in most rocks is so slow that the two layers are, in effect, superimposed.

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