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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Over geologic time, increased pressure from the overlying rocks changed the layers of organic material into coal.

经历了数代地质期，上层岩石逐渐增大的压力改变了无机矿物层的构成，最终形成了煤。

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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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