Monday, Sept 29, 2008 EQ: What Forces Affect the Earth?

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Presentation transcript:

Monday, Sept 29, 2008 EQ: What Forces Affect the Earth? Journal: What evidence do we have the Pangea once existed? Agenda Return Quizes/Discuss Plate Tectonics Intro Plate Tectonics guided reading/notes Simon Says Review

Continental drift

Alfred Wegner suggested 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

Wegners supporting evidence the fit of the continents the distribution of fossils a similar sequence of rocks at numerous locations ancient climates the apparent wandering of the Earth's polar regions

What is the Lithosphere? The crust and part of the upper mantle = lithosphere Less dense than the material below it so it “floats”

What is the Asthenosphere? The plastic layer below the lithosphere = asthenosphere The plates of the lithosphere float on the asthenosphere

Platetectonics The theory states that Earth's outermost layer, the lithosphere, is broken into 7 large, rigid pieces called plates.

2 Types of Plates Ocean plates - plates below the oceans Continental plates - plates below the continents

Divergent Boundaries Boundary between two plates that are moving apart or rifting  

Convergent Boundaries Boundaries between two plates that are colliding  

Tuesday, 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

Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Homework-Finish Notes Worksheet (both sides) Agenda Discuss Journal Entry Convection Current Model Sea Floor Spreading Finish Notes Worksheet TOTD-How do convection currents relate to plate tectonics

Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Convection Currents Go to one of each convection stations and draw what you see. Describe what is happening Where do you see “rising” and “sinking”?

Wednesday October 1, 2008 EQ: What Forces Affect the Earth? Journal-Explain the theory of Seafloor Spreading? Test on Friday

Wednesday October 1, 2008 EQ: What Forces Affect the Earth? Agenda Discuss Journal Entry Plate Boundaries Activity Fault Notes and Demo Go Over Homework from Yesterday Study Guide