Bell Ringer Copy the assignment in your daily learning log Continental Drift Cornell Notes & Demonstration (Pg. 7) Write down your homework in your agenda

Convection Current Demonstration Observations What temperature was the red dye and what direction did the red dye move? What temperature was the blue dye and what direction did the blue dye move? Analyze Data What do you think the density of the red dye is compared to the water? Why? What do you think the density of the blue dye is compared to the water? Why? Draw Conclusions: In one sentence, describe what causes convection currents (rising and sinking of materials) Convection currents (seen in the demonstration) occur in the asthenosphere, located below the lithosphere. By observing this lab, why do the lithospheric plates (tectonic plates) move on the earth’s surface?

CER What causes Earth’s tectonic plates to move? Write your claim and at least 2 pieces of evidence: earth’s rotation on its axis earth’s revolution around the Sum tides and wind currents convection currents in the mantle

Topic: The Lithosphere, Pangaea, and Plate Tectonics

Continental Drift Cornell Notes Key Terms Notes Summary:

REVIEW What is the lithosphere made up of? A: Crust and Upper Mantle

Continental Drift Wegener came up with a theory in 1910 called Continental Drift. His theory said that the continents had started as one big “super continent” called Pangea.

Continental Drift Over millions of years, Pangaea broke apart into the continents. During Pangaea, continents had completely different environments and climates.

Evidence that supported Wegener’s Theory 1. Change in Climate –Example: Glaciers in Africa Glacial striations, the parallel "scrape" marks on rocks caused by moving glaciers, have been found on rocks in South America, Africa and Australia and are of similar orientation to striations found on Antarctica 2. Puzzle-like Fit of the Continents -Example: Africa and South America In several cases, modern shorelines of continents look as though they were once joined

Evidence that supported Wegener’s Theory 3. Landforms -Example: Mountain chains Some mountain chains, have very similar rocks and structures (i.e., folds and faults) to mountain belts found on other continents 4. Fossil Evidence -Example: Mesosaurus There are many examples of fossils found on two continents that are currently separated by vast oceans

Continental Drift Rejection Scientists at the time rejected his theory because he could not come up with an explanation why the continents were actually moving.

Theory of Plate Tectonics The lithosphere (crust and upper mantle) is made of moving plates that float on the asthenosphere. Convection currents cause magma in the asthenosphere to rise and sink. The plates are slowly moving and bump into each other

Discovering Plate Tectonics: Changes in Earth’s Surface

TUESDAY HOMEWORK Complete questions and summary of Continental Drift Cornell Notes

Continental Drift: Sketch a Picture “Draw a picture”- As I read the passage aloud, draw (pictures) of what you are hearing about evidence of continental drift. *Try to draw at least one picture per section Pictures do not need to be detailed or drawn well- these are YOUR memory cues of the article!