A period in the history of the earth, usually shorter than an epoch.

期，纪：地球历史进程中的一个时期，通常比世短。

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There are many gradations of evolutionary events in the history of the Earth.

在地球的历史上，存在着不同层次的生物进化事件。

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Geology is the study of the Earth's crust. We can understand the history of the Earth through this field.

地质学是对地球地壳的研究。我们可以通过此项领域来了解地球的历史。

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In the early eighteen hundreds in England, Mary Anning became one of the first women recognized for her discoveries about the ancient history of the Earth.

VOA: special.2009.05.13

It uses objects from the museum's collection to show how Darwin helped us understand the history of life on Earth.

VOA: special.2009.12.01

"This valley of history has seen mankind complete its first evolutionary steps into the universe: leaving the planet Earth and going forward into the universe.

VOA: special.2010.04.28

We inherited the greatest nation in the history of the Earth.

NPR: Palin Takes Aim At Obama, Revs Up Republicans

"Methane hydrate was a key cause of the global warming that led to one of the largest extinctions in the earth's history, " Ryo Matsumoto, a professor at the University of Tokyo who has spent 20 years researching the subject, told Bloomberg in December.

FORBES

The team also hopes to take samples of mud from the bottom of the lake, to better understand the geological history of the West Antarctic Ice Sheet and Earth's past climate.

MSN: Mission to drill into buried Antarctic lake hits a snag