1Earth’s Place in the Cosmos, Earth’s Structure,History of AstronomyEARTH SCIENCE 104Peer Led Team Learning• ES104x “PLTL”• 1 hour credit: not graded (Pass/NC)• First meeting this week: • Thursday 4 PM•NS 101•RyanKornis team leader Brown is instructor of recordRyan Kornis team leader, Brown is instructor of record• Sign up now or at first meeting: Blue sheets up front.• CRN 11170Syllabus page 4Syllabus page 5 Syllabus page 5 Syllabus page 5Syllabus page 6 Syllabus page 6 Syllabus page 62Syllabus page 7Introduction No lab this week Must pass lab to pass this class Instructors will give percent lab grade to one anotherGet Lab Manual Get Lab Manual this week Do PRELAB 1 before lab next week Bring manual to lab each weekPlanet Earth Surface covered with HydrosphereAtmosphere http://www.earthscienceeducation.com/creative_science/chemistry_index.htmBiosphereGeospherehttp://www.miamisci.org/ecolinks/geosphere.htmlSphere interactionsComplex Interactionshttp://www.msu.edu/~colungag/docs/philosophy.htmHydrologic Cyclehttp://www.mnforsustain.org/water_climate_global_water_cycle_study.htm3Crusthttp://earthquake.usgs.gov/learning/glossary.php?term=crustTectonic PlatesTectonic movementsInternal and external cycles ConvectionEarth’s Structure Rocky Planet Silicates Metals Melting allowed gravity to separate by density Metals drawn to center Silicates dominate the remainder Oxygen and Silicon most common elements Combine with other elements to make feldspars, pyroxenes, amphiboles and quartzCompositionCore ~ 3500 km radiusCore 3500 km radius metal Mantle ~ 2900 km thick High iron, magnesium silicate rock Crust < 100 km High aluminum silicate rockEarth’s Interior Properties Inner core: solid Outer core: liquid Lower mantle: fairly solid Asthenosphere: mobile Lithosphere: rigidInternal Division Mantle-Crust boundary is compositional More silica, less iron, magnesium in crust than mantleAth hLith h Asthenosphere-Lithosphere boundary is based on properties Asthenosphere is weak, flows Lithosphere is rigid and contains some of the upper mantle, and all of the crust4Interface of spheresSolar system formed from nebular cloud cloud Occurred about 5 billion years agoNebular Hypothesis of Solar System Formation.Nebular Hypothesis NEBULA—Rotating cloud of dust and gases Our solar system Sun Major Planetsj Dwarf planets, asteroids and comets Hypothesis that it formed from nebula by gravitational contraction and solids colliding and becoming planets, etc. Big Bang forms all matter Much more ancient than nebular collapse “Beginning of the universe” about 14 b.y.a.Was the ‘big bang’ the event that formed our solar system?No! The ‘big bang’ was the singularity that created the matter and space of the universe It occurred about 9 billion years universe. It occurred about 9 billion years before our solar system condensed from a nebula. What is a nebula?a swirling cloud of dust and gasesClickers We will use clickers to log your attendance by the last 6 digits of your V number. You will need it for this class each day so bring it or memorize iteach day, so bring it or memorize it. The clickers can only record a SINGLE DIGIT for any slide I will ask for just one digit at a time For example, first enter 1 if your v00# is V00143258 Wait for next slide to enter the
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