Introlecture - Planet Earth Intro Lecture Planet History of...

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Planet Earth: Intro Lecture Planet Earth: Intro Lecture
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~1000 BC: Earth is a flat disk with water at its edges and land in middle. Stars overhead in Celestial Sphere with Hades below. History of Concepts
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Heracledes (330 B.C.) formalized Plato's first Solar System model, the Geocentric model.
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circa 1500’s…Copernicus’s revolution… the Heliocentric View of the Universe…
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1600’s: Kepler showed planets had elliptical orbit …the hallmark of Ptolemy’s calculations for the geocentric hypothesis was wrong
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Circa1600…Galileo uses newly invented telescope to Circa1600…Galileo uses newly invented telescope to establish conclusively that planets revolve around sun establish conclusively that planets revolve around sun
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Geology Comes of Age! Geology Comes of Age! Late 18 th century “Age of Reason” opens way for “modern science”. Science and religion diverge. Catastrophism Catastrophism vs. vs. Uniformitarianism
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Catastrophis Catastrophis m m Earth affected in distant past by sudden, short-lived, violent events. Sometimes worldwide in scope. Formation of moon Different processes operated in the past.
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Uniformitarianis Uniformitarianis m m The present is the key to the past.” The present is the key to the past.” James Hutton James Hutton 2) Small forces operating over great periods of time can produce Earth’s major features. - gradualism . 1) Natural laws do not change through time. (1726-1797)
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The big difference between geology and other sciences: TIME! Central to Hutton’s view of Earth history: deep time - “…we find no vestige of a beginning, no prospect of an end.”
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Great Flood! Great Flood! J. Harlan Bretz (1920s) J. Harlan Bretz (1920s) Catastrophism Catastrophism What Formed the Scablands?
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Methods to Measure Time Methods to Measure Time 1) relative dating: fossils and layering 2) absolute dating: radioactive isotopes
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Principle of Principle of Faunal Succession Faunal Succession Vertical ordering of fossil taxa reflecting the process of evolution and extinction.
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