AST101H1 Lecture Notes - Lecture 9: Planetary Science, Lithosphere, Volcanism
3 Oct 2016
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AST101H1 Full Course Notes
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Heavilly cratered, steep cliffs= pne that extends lower left to upper right of the planet. Impact craters and dry riverbeds: comparative planetology, active vs inactive geology. Active geology for earth: rocky crust (low density, mantle (medium density, metal core (highest density, rigid lithosphere (crust and part of mantle. Inactive geology for mercury, mars, and the moon. lithosphere. )accretion: smash stuff into it (mainly happened during the early formation of the galaxy. )differentiation: makes the heavy stuff sink to the interior, giving up gravitational energy in the form of heat. occurred when planets were young: radiaoactivity: radioactive atoms decay and produce energy. Convection: heat is carried by hot material; moving to cooler area, ex. boiling. Radiation: heat is carried away by electromagnetic radiation ex. When you see if a light bulb is hot by placing your hand near it. Cooling rate = surface area divided by volume. Planets with a bigger radius have more activity.
