Item talk:Q66879
From geokb
{
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Precambrian time spans almost nine-tenths of Earth history, from the formation of the Earth to the dawn of the Cambrian Period. It represents time so vast and long ago that it challenges all comprehension.\r\n\r\nThe Precambrian is the time of big questions. How old is the Earth? How old are the oldest rocks and continents? What was the early Earth like? What was the early atmosphere like? When did life appear, and what did it look like? And, how do we know this?\r\n\r\nIn recent years, remarkable progress has been made in understanding the early evolution of the Earth and life itself. Yet, the scientific story of the early Earth is still a work in progress, humankind's latest attempt to understand the planet. Like previous attempts, it too will change as we learn more about the Earth. Read on to discover what we know now, in the early 21st century.", "description": "4 p.", "publisher": { "@type": "Organization", "name": "Geological Survey (U.S.)" }, "author": [ { "@type": "Person", "name": "Lindsey, D. A.", "givenName": "D. 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