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Lecture 3

Science is built of facts the way a house is built of bricks, but an accumulation of facts is no more science than a pile of bricks is a house. - Henri Poincare ’ Creation and development of the Earth. Lecture 3. Webpage for course (daytime). Webpage for course (nighttime).

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Lecture 3

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  1. Science is built of facts the way a house is built of bricks, but an accumulation of facts is no more science than a pile of bricks is a house. - Henri Poincare’ Creation and development of the Earth Lecture 3 Webpage for course (daytime) Webpage for course (nighttime)

  2. Observations about our Solar System1. planets, moons, asteroids form ring @ sun 2. all these revolve in same direction 3. most have similar orientations 4. most rotate in same direction, as does sun 5. many moons have same general features 6. distribution of planets Terrestrial vs. Jovian

  3. Nebula Hypothesis

  4. Nebula Hypothesis

  5. Earliest structure of the earthunsorted mix of compacted gas and dust?

  6. Sources of heat - impact of meteorites - compression - radioactive decay How did earth become molten?

  7. Thin crust Differentiation of earth by density heavy material in middle of earth (core) lighter material in crust intermediate density in mantle Formation of atmosphere convection cells in mantle This history explains

  8. - plate tectonics (continental drift) - mountains - erosion and deposition Thin crust and convection cells in mantle help account for

  9. Our earth is a very active planet

  10. Nature’s Law is change; constancy is strange.

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