4PTYS_206_interiors_surfaces

4PTYS_206_interiors_surfaces - PYTS/ASTR 206 Terrestrial...

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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 1 Announcements Homework #2 due on Thursday In-class assignment You can answer the questions as we go along There’ll also be a few minutes at the end to fill this in Save the last question for these final 5 minutes Talk with your neighbors during these last few minutes but not during the lecture Anyone missing a TI-30XA calculator?
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 2 PTYS/ASTR 206 – The Golden Age of Planetary Exploration Shane Byrne – shane@lpl.arizona.edu Terrestrial Planet Interiors and Surfaces
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 3 In this lecture… Internal structure of rocky planets Earthquakes and what they tell us Sources of heat How volcanoes work Wind-related (aeolian/eolian) processes Fluvial processes
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 4 Rocky planets have several parts Core – Iron/Nickel Mantle – Rocky Crust – Rocky (different composition) Strong rocks near surface Colder rocks = stronger rocks Lithosphere Rocks are brittle Weak rocks deeper Hotter rocks = weaker rocks Asthenosphere Rocks flow Core Solid in center – inner core Surrounded by liquid iron – outer core Internal structure
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 5 All rocky planets follow the same basic model Differ in the details – like core size Smaller bodies cool off faster – thicker lithospheres Details for later… Earth has two separate types of crust and plate tectonics The Moon may not have a core Mercury’s core is enormous compared to its size
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 6 Compositional vs mechanical terms Crust, mantle, core are compositionally different Lithosphere, Asthenosphere, Mesosphere, Outer Core and Inner Core are mechanically different Lithosphere is divided into plates… More on this in the Earth lecture
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PYTS/ASTR 206 – Terrestrial Planet Interiors and Surfaces 7 How did things get this way? Planets formed from solar disk Started as uniform lumps of rock and metal Proto-Earth was hot Material could flow Dense material (iron etc. .) sinks Lighter stuff (rocks) float
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8 Homogeneous mix of rock and metal Liquid metal core with rocky mantle Takes only a few million years Core cools and solidifies from inside out
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4PTYS_206_interiors_surfaces - PYTS/ASTR 206 Terrestrial...

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