碳循环是一个生物地质化学循环圈，碳通过此循环在生物圈、土壤圈、地层、水圈、大气中交流。
The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
地壳早期演化研究的主题是探讨早期大陆形成、生长和再循环的地质过程及其地球化学和地球物理模式。
The topic of the study of the evolution of early crust is to probe into the processes of early continental formation, growth, and recycling, and their geochemical and geophysical models.
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