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Unformatted text preview: sites?-Timeline of lunar history is built-up from the Apollo samples-Crater density plot is calibrated from the Apollo samples o Able to apply plot to all planets 5 Stages of Planetary Evolution I. Origin- Planetesimals collide to form a world in space II. Differentiation- Heating from the radioactive decay of elements cause heavier elements to sink to the center, and lighter elements to rise to the surfaces of a world III. Late Heavy Bombardment- World is exposed to heavy bombardment from other bodies in space. The scale of these bombardments declines through time. IV. Geological Activity- As a result of differentiation, geologic activity occurs on the world. Plate tectonics and volcanism shape the world and its surface. V. The Big Chill- Geological activity stops as radioactive elements run out. It no longer shapes the world and its surface....
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This note was uploaded on 04/19/2008 for the course OCEAN 250 taught by Professor Dr.clairehorner-devine during the Fall '08 term at University of Washington.
- Fall '08