Presentation on theme: "Monday, Sept 29, 2008 EQ: What Forces Affect the Earth?"— Presentation transcript:
1Monday, Sept 29, 2008 EQ: What Forces Affect the Earth? Journal: What evidence do we have the Pangea once existed?AgendaReturn Quizes/DiscussPlate Tectonics IntroPlate Tectonics guided reading/notesSimon Says Review
3Alfred Wegnersuggested that a supercontinent he called Pangaea had existed in the past, broke up starting 200 million years ago, and that the pieces ``drifted'' to their present positions
4Wegners supporting evidence the fit of the continentsthe distribution of fossilsa similar sequence of rocks at numerous locationsancient climatesthe apparent wandering of the Earth's polar regions
5What is the Lithosphere? The crust and part of the upper mantle = lithosphereLess dense than the material below it so it “floats”
6What is the Asthenosphere? The plastic layer below the lithosphere = asthenosphereThe plates of the lithosphere float on the asthenosphere
7PlatetectonicsThe theory states that Earth's outermost layer, the lithosphere, is broken into 7 large, rigid pieces called plates.
82 Types of PlatesOcean plates - plates below the oceansContinental plates - plates below the continents
9Divergent BoundariesBoundary between two plates that are moving apart or rifting
10Convergent Boundaries Boundaries between two plates that are colliding
11Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Journal: Name two types of plate boundaries and draw arrows representing how they move.Test on Friday-Plate Tectonics and Earth’s Structure
12Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Homework-Finish Notes Worksheet (both sides)AgendaDiscuss Journal EntryConvection Current ModelSea Floor SpreadingFinish Notes WorksheetTOTD-How do convection currents relate to plate tectonics
13Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Convection CurrentsGo to one of each convection stations and draw what you see.Describe what is happeningWhere do you see “rising” and “sinking”?
14Wednesday October 1, 2008 EQ: What Forces Affect the Earth? Journal-Explain the theory of Seafloor Spreading?Test on Friday
15Wednesday October 1, 2008 EQ: What Forces Affect the Earth? Agenda Discuss Journal EntryPlate Boundaries ActivityFault Notes and DemoGo Over Homework from YesterdayStudy Guide