A spherically symmetric structure of the earth has been assumed.

人们把地球的构造假设为球状对称。

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Geology: the scientific study of the origin, history, and structure of the earth.

地质学对地球起源、历史和结构的科学研究。

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Meteorite strike events have severe, great and long-term impact on strata structure of the earth surface.

历史上发生的陨击事件对地球表面岩层构造产生了极其严重、刻和长远的影响。

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There were thousands of people from all over the world circumambulating this sacred structure at the center of the Earth, all there for a common purpose of praising God, yet each engaged in private reflection oblivious of any other.

CNN: The story of Mecca as it's never been told before

This information should give scientists fresh insight into the internal structure of Earth's satellite.

BBC: Nasa reveals new information about moon probes crash sites

The team claims observations of the fine structure of the burrows show they were overgrown by chlorite after being pushed beneath the Earth.

BBC: NEWS | Science/Nature | Early life thrived in lava flows