Trắc nghiệm: According to geological discoveries. 4.6-billion-vears life span of our planet is divided into four time intervals called eras,According to geological discoveries. 4.6-billion-vears life span of our planet is divided into four time intervals called eras.

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According to geological discoveries. 4.6-billion-vears life span of our planet is divided into four time intervals called eras, According to geological discoveries. 4.6-billion-vears life span of our planet is divided into four time intervals called eras.

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