a1_15_review_terrestial_v4

a1_15_review_terrestial_v4 - Overview: The Terrestrial...

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Overview: The Terrestrial Planets -
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A quick review and comparison of the Terrestrial Planets…plus Earth ʼ s Moon
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Revolutions in Planetary Science Development of Earth’s plate tectonics paradigm Solved puzzle of mountain range formation Explained discovery of mid-ocean mountain ranges Explained ocean trenches and subduction zones Age of crust and magnetic strips on ocean floor. “Ring of Fire” in the Pacific. Biological effects due to plate movements Planetary Exploration Showed different means of the release of planetary heat Different examples of surface evolution Importance of impacts on planetary surfaces Variations in surface chemistry due to varying history and location in S.S.
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Prior to 1960’s geologist were much like astronomers in the pre-Copernican, Earth centered mindset. Then, due to the Apollo missions to the Moon, the Viking 1 and 2 landers and orbiters around Mars, Magellan to Venus, and Voyagers 1 and 2 to the Outer Solar System, thus began the field of Comparative Planetology
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Three Fundamental Surface Processes 1. Impact Cratering 2. Volcanism 3. Tectonism The Chief Interior Process: : Differentiation Leading to Core, Mantle, and Crust
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Differentiation : The basic cause for dense cores and low- density crust and mantles. After heat of formation, there is additional heat in the interior due to the decay of radioactive elements. The mantle has the most mass…so it melts Frst.
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Planetary Interior Comparison
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Two ways to look at internal construction: Compositional and Thermal
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Primary, Secondary, and Tertiary Crust Primary: created early in planetary history, e.g., lunar highlands Secondary: partial melting of mantle plus volcanoes. Tertiary: recycling of primary and secondary crusts, e.g. Earth & Venus
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Moon: highlands due to initial impact melting Mercury: highlands and intercrater plains Mars: volcanic plains and tharsis bulge formed a lot of secondary crust. Venus: covered with
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a1_15_review_terrestial_v4 - Overview: The Terrestrial...

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