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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