TOPIC 13-Continental Drift

TOPIC 13-Continental Drift - IdeasaboutEvolutionofEarth:

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Ideas about Evolution of Earth: science in action - paradigm shift static to dynamic (e.g. universe) know your earth Pre-Renaissance (Static Earth). Renaissance to 20th Century (Geophysics & Continental Drift). 20th Century (Sea Floor Spreading). Present-Day Perspective (Plate Tectonics Paradigm).
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Nature of Earth: from the Greeks through  the Dark Ages .   Pre-1600: Myth and Religious view of Earth Catastrophism – catastrophic events due to angry gods. – Poseidon (Neptune) – god of earthquakes – Typhon – many-headed monster, source of storms – Zeus – sky and weather god – Hades (Pluto) -  god of the underworld – Vulcan – god of fire, volcanoes – Center of Earth = Hades
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Dante’s Map of Hell Geologists Geophysicists?
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Greek Science: Knew the Earth was round.  Assumed that continents were fixed. No information about ocean floor or earth’s interior. Natural processes (not gods) formed geologic features.     Heredotus (484-426 B.C.), Empedocles (?),  Pliny (23-79  A.D.) all studied geology, the latter two died while  observing volcanoes.
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The Development of Geophysics (internal structure earth) Renaissance to 20 th  century
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Changing Views of Earth:    Beginning of Geophysics. 1687 Newton’s laws of  motion & gravity. 1650-1750 Start of  Geologic mapping. Combine into Start of  Geophysics .
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Changing Views of Earth  Late 1700’s: Average density of earth = 5.5 g/cm 3 . – Since surface rocks = 2.7 g/cm 3  inner earth must be more dense.          1785-1795: James Hutton  “Founder” of modern geology: Dynamic view of earth as an “internal heat engine” rather than static. Igneous rocks = formed at depth by melting and intruded upwards. Uniformitarianism = the steady-state evolution of earth by often slow  processes we can observe today.  Earth history VERY old: the man who found “deep time”
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Hutton and plutonic theory Reproduction of a Watercolor print done by geologist James Hutton entitled, Detailed East-West Section, Northern Granite, Isle of Arran, Strathclyde or Theory of the Earth
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Hutton and the rock cycle Required millions of years
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Changing Views of Earth 1873: J.D. Dana: meteorites = parts of planets:  
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This document was uploaded on 09/03/2010.

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TOPIC 13-Continental Drift - IdeasaboutEvolutionofEarth:

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