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Summary Ch 21, 22 Terrestrials

Summary Ch 21, 22 Terrestrials - Chapter Summary...

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Chapter Summary Chapters 21, 22: Terrestrial Planets 1. Comparative Planetology (read text and ppt for details) craters impact cratering volcanoes volcanism (lava, outgassing) cliffs --------\ mountains -------- tectonics plains --------/ ice caps magnetic field rotation axis tilt effect of distance from the Sun heating/cooling of interior erosion (water, ice, wind, debris) Core: Highest density; nickel and iron Mantle: Moderate density; silicon, oxygen, etc. Crust : Lowest density; granite, basalt, etc. lithosphere: the relatively rigid outer layer of a planet that encompasses the crust and the uppermost portion of the mantle. 2. Differentiation: Gravity pulls high-density material to center Lower-density material rises to surface Material ends up separated by density 3. Heating of Interior early: accretion & differentiation today: radioactive decay 4. Cooling of Interior Convection transports heat as hot material rises and cool material falls Conduction transfers heat from hot material to cool material Radiation sends energy into space 5. Sources of Magnetic Fields
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