In geologic time, a million years is recent history.

在地质学角度看来，一百万年前属于近代历史。

Planet size matters when it comes to the internal heat needed to sustain geologic activity.

经过计算，行星需要有足够大质量内部才会有足够地热而形成各种地质活动。

Megalodon, fossils are found in the kind of geologic deposits that form pretty close to shore.

能在离海岸非常近的地质沉淀物中，发现巨齿鲨的化石。

Geologic processes buried and shifted the shoreline footprints to the cave's ceiling, 500 meters deep.

地质过些脚印，并将脚印从海岸线转移到洞穴500米深处的顶部。

Ancient ruins and artifacts only take us back a few thousand years, geologic records only about 2 million.

古代遗迹和手工制品只能带我们回到几千年前，地质记录也只能到约 200 万年前。

But scientists have also found lots of soot in the geologic layers deposited immediately after the asteroid impact.

但科学家们也在小行星撞击后立刻沉积的地质层中发现大量煤烟。

We do understand that the dominant geologic process that affected Mercury, or at least Mercury's surface is impact cratering.

我们知道，水星的地质演化中陨石撞击坑是主要的影响。

Ide is now doing a similar analysis on earthquakes that all happened in the same geologic setting, like subduction zones.

井出哲现在正在对所有同一地质环境下发生的地震进行相似性分析，比如说消减带。

Cheap fossil energy, concentrated by geologic time and pressure in seams of coal or pools of oil, changed all that.

经过地质时间和压力的凝缩，富集于煤层和油田中的廉价化石能源改变一切。

It behaves more or less like a solid, but over long periods of time, geologic periods of time, it can flow.

它的行为或多或少有点像固体，但在很长的时间周期里（地质学意义上的周期），它其实是流动的。

And for small objects, weak objects, they will be completely destroyed by those forces long before they get to the geologic surface of our planet.

在些小又微弱的物体变成地球地质面的之前，将会完全被摧毁在离地面很高的大气中。

To explore this theory, we have to wind the geologic clock back 4 billion years to a time when the Earth was hot and still forming.

为探索一理论，我们必须将地质钟拨回到40亿年前，那时地球还很热，仍在形成当中。