他表示，低浓度是由一系列火山活动储存新的硅酸盐岩石触发的。
The dip, he says, was triggered by a burst of volcanic activity that deposited new silicate rocks.
但是，随着冰层扩展逐渐覆盖了硅酸盐岩石，使岩石形成放缓，所以导致CO2在大气层中再次聚积。
As the ice spread, however, it gradually covered the silicate rocks, slowing the erosion and so allowing CO2 to build up in the atmosphere once more.
通过从COROT - 7b以及邻近的COROT - 7c收集到的数据，研究人员能够很有把握地宣称，这颗行星几乎像地球的地壳一样由硅酸盐岩石组成。
By gathering data from both COROT-7b and nearby COROT-7c, researchers determined that the planet is almost certainly made up of silicate rocks like the ones in Earth's crust.
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