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The Science of Historical GeologyCh1 - The Science of...

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The Science of Historical Geology Chapter 1 Our planet formed about 4.56 billion years ago. Between 300,000 and 150,000 years ago a species of primate called Homo sapiens evolved on Earth. They were unlike any previous life form with oversized brains and nimble fingers. Civilizations were curious about the earth and how it was shaped, formed, etc. Within the past 100 years it has been charted and mapped thoroughly except for a few areas of great cold or dense tropical forest. Now exploration has moved to beneath the ocean and out towards space. Why study earth history? It is believed that understanding the past will allow us to see into the future because we believe that the history of the earth will repeat itself. In the past continents have been flooded, and have moved around the globe to collide with others to form mountains, massive land clearing glaciers, earthquakes, volcanic eruptions, impacts of meteriods, and changes in the chemistry of the ocean and atmosphere. Along with earth, life on earth has
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