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Unformatted text preview: Answer the following questions based on the video How the Earth Was Made from the History Channel Who is considered to be the Father of Geology? James Hutton Where is he from? Maverick-Scottish farmer Who was Kelvin? First proposes hellish origin of the planet. Victorian scientist British expert in thermodynamics. Believed that the earth was slowly cooling down. Used thermodynamics to calculate a new age for the earth. The fire of planets interior suggested to him that the earth was once entire molten Reasoned the molten would need 20 million years to cool to present temperature. Correct about the molten but not about the age: WAY UNDERESTIMATED Unaware of a key source of heat inside early earth that prevented the planet form cooling: radioactivity Who was Holmes? 1911, a gifted 21 year old geology student. Used radiation to revolutionize our understanding of earth history Talked in billions of years. Radiometric dating: measure the proportion from uranium that decayed into lead o Measures proportion of uranium to lead in crystals trapped in ancient rocks Holmes could accurately count their ages...
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- Spring '07