EPS SCI 3 Lecture Notes - Lecture 5: Mantle Convection, Circumstellar Habitable Zone, Radiogenic Nuclide
28 Oct 2017
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Document Summary
After 100 to 500 million years, most of the debris is swept up or ejects by planets. Planets cool and assume present appearance govern a planet"s evolution. Convection: hot rock rises and cooler rock falls in mantle convection cell. Conduction: carries heat through lithosphere into the surface. Radiation: at the surface, e is radiated into space. Accretion: gpe is converted into kinetic energy (ke), which creates thermal. Differentiation: light materials rise to surface while dense materials fall to the core. Radioactive decay: mass-energy contained in nuclei is converted to te. Formation of crust and early period of heavy cratering. Mars: cratering ended a billion years ag. Most likely as a subsurface ocean underneath an icy shell. A fictitious region in space that defines where upon it it can have water in its liquid phase on a planetary surface. If it"s too hot, water is gonna evaporate. If it"s too cold water will freeze. Different stars therefore have different habitable zones.
