地球的历史包含着许多不如全新世稳定与温和的地质时期。
The planet's history contains many less stable and clement eras than the holocene.
有证据表明，这一时期发生了重大的生态和地质变化。
There is evidence of major ecological and geological changes during this period.
今天的北极冰层比近代地质史上任何时期都少。
Less ice covers the Arctic today than at any time in recent geologic history.
河流水文特征，决定河流地质作用的主要时期；
Hydrological characteristics decide the main period of the river geological process.
河流水文特征，决定河流地质作用的主要时期；
Hydrological characteristics decide the main period of the river geological process.
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