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zv) But First Some Astronomy and Earth Science. The Origin of the Earth - About 4.6 Billion (4,600 Million) Years Ago.jpg
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%20But%20First%20Some%20Astronomy%20and%20Earth%20Science.%20The%20Origin%20of%20the%20Earth%20-%20About%204.6%20Billion%20(4%2C600%20Million)%20Years%20Ago.jpg "zv) But First Some Astronomy and Earth Science. The Origin of the Earth - About 4.6 Billion (4,600 Million) Years Ago.jpg")