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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.

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Presentation on theme: "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."— Presentation transcript:

1 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

2 Continental drift

3 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

4 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

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

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

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

8 2 Types of Plates Ocean plates - plates below the oceans Continental plates - plates below the continents

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

10 Convergent Boundaries Boundaries between two plates that are colliding  

11 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

12 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

13 Tuesday, Sept 30, 2008 EQ: What Forces Affect the Earth Convection Currents 1.Go to one of each convection stations and draw what you see. 2.Describe what is happening 1.Where do you see “rising” and “sinking”?

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

15 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

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