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Video: Evidence for Continental Drift What was Wegener’s theory? What evidence did he use to support it? Why was his theory not accepted during his time?

12-1C: Piecing Together Pangaea p515 Work in pairs or alone Cut along the DOTTED LINES. These are where the continental shelves are. Ignore the star outside of the continents Place the pieces in their current positions. Using all available evidence, move pieces to where they likely would’ve been as Pangaea

Different types of shading (dots, lines) indicate different types of rocks for mountains. Line orientation should match up Arrows of glaciers tend to radiate out, like sun rays Match up fossil evidence

Write down answers to Analyze and Conclude & Apply Place cut up pieces into Ziploc when done

Video What did Harry Hess observe? What did he conclude from these observations?

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Mid-Atlantic Ridge Revealed by mapping ocean floor Iceland located over the Ridge

Age of rocks Sediment thickness Paleomagnetism: suggests that the Earth’s magnetic north

and south poles have alternated

Hot Spots Discuss the information given by this diagram.

Where is the hot spot?

(c) McGraw Hill Ryerson 2007

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Graphic organizers Graphically organize information whenever you can

– scan the text first before taking notes. Better recall Easier to find important information Helps prevent mindless copying

Work Read p504-509 Make notes on Evidence for Continental Drift on the WS Use the centre box to make notes on what is continental drift. You should be able to answer RC on 509 just from the notes you

took. Read p510-513 Complete WB p211&212

Check Your Understanding p517 #1-12. Try to answer these from your own memory. Put a star on your paper next to the ones that were difficult to remember

A Cross Section of Earth over 12,000 km thick, and has four distinct layers.

See pages 518 - 521

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Features of Tectonic Plates

(c) McGraw Hill Ryerson 2007What is this picture showing? Describe it

Plate Interactions Plate boundary: where two plates are in contact Interactions based on: type of platedirection of plate movement relative to each other.

Divergent boundaries Convergent boundaries Transform boundariesOpen to p523: All plates are moving at the same time. With a partner, take turns describing the three types of plate boundaries. Give an example of where each occurs.

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What do you notice about the distribution of earthquakes and volcanoes?What kind of boundary are most volcanoes found near?

Triangles: volcanoes. Dots: earthquakes

What are the features of oceanic-continental plate convergence?

What are the features of oceanic-oceanic plate convergence?

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Slab-pull, Ridge-push

Volcanoes

Continental-Continental Plate Convergence

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What evidence is there that this was once flat at bottom of the ocean?

(c) McGraw Hill Ryerson 2007

Transform Plate Boundaries

Work Read p518-526. Use the worksheets to take notes.

Add any information that you think is important from the reading, but is not included in the worksheets

WB p218 Plate interactions WS (back of p218)

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Earthquakes Often from the friction between moving tectonic plates (~95% of all quakes) Juan de Fuca convergent plate boundary west of Vancouver Island:Large earthquakes hit this region every 200 -800 years.

Elastic Rebound Theory

(c) McGraw Hill Ryerson 2007

Describing Earthquakes Scientists understand why they happen, but it is very difficult to predict their timing, exact location and strength.

build-up happens underground, over very long periods of time. Our understanding has helped prepare structures to survive them.

Wave energy: Richter Scale Intensity: Mercalli scale (I-XII, based on damage & impact on humans)

The Great San Francisco Earthquake 1906

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Focus & EpicenterWould shallow focus or deep focus earthquakes cause more damage?

Where do deep-focus earthquakes occur?

Seismic Waves form when the energy of an

earthquake is released. reveal the source and strength

of an earthquake.also help us learn about the

composition and distances of the Earth’s interior.

See page 529

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Types of Seismic Waves Primary, or compressional,

wave (P-wave) Secondary, or shear, wave

(S-wave) Surface wave

(can be Love or Rayleigh waves)

Seismic Data How long would it take S-waves to reach a seismometer that was 2500 km away?If L-waves arrive 9 minutes after P-waves, approximately how far away was the epicentre from the seismometer?

Work WB p220 WB p213 & 221 – try to answer without

referring to notes Chapter Review p538#2a, b, c, e; 3 - 7, 10, 16, 18, 23

Unit Review p546#26, 28, 40a, 41, 42, 45, 57, 61, 62

Chapter 12 Test: 20 MC, Analyse graph