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Download Small Terrestrial Planets Large Terrestrial Planets
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Small Terrestrial Planets interior cools rapidly Large Terrestrial Planets warm interior causes mantle convection volcanic and tectonic activity ongoing. most ancient craters are erased. volcanic and tectonic activity ends after about a billion years. many ancient crators thus remain. low volcanism gives little outgassing and low escape velocity means little atmosphere and little erosion outgassing produces an atmosphere and high escape velocity meansthe atmosphere is retained and erosion is possible. core may be molten, producing a protective magnetic field if rotation is fast enough.
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