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Tuesday, October 23 rd. How do convection currents form ? a. heated mantle material is less dense and rises to the top of the asthenosphere b. mantle material cools under the lithosphere, becomes more dense, and sinks c. seismic waves act like a big spoon and stir up mantle material

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Tuesday october 23 rd
Tuesday, October 23rd

How do convection currents form?

a. heated mantle material is less dense and rises to the top of the asthenosphere

b. mantle material cools under the lithosphere, becomes more dense, and sinks

c. seismic waves act like a big spoon and stir up mantle material

d. both a and b are correct


Corny joke of the day
Corny Joke of the Day

What did one mountain say to the other after the earthquake?

“It isn’t my fault”


Tier 2 PT=

Tomorrow


Quiz answers

Quiz Answers

10 pts Each


Project grades

Project Grades

Individual and Group












Review plate tectonics 2 convergent boundaries

Review Plate Tectonics #2Convergent Boundaries


  • A convergent boundary is where two plates come together, or converge. The result of the plates hitting together is called a collision.


There are three combinations of how

earth's crust can come together.

a. Continental crust to continental

b. Continental crust to oceanic

c. Oceanic crust to oceanic


a. Continentalcrust to continentalcrust

Before collision

MOUNTAINS

Example: India-Asia

(Himalayas)

After collision

from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270


Eurasian plate

Indian plate

Indian plate (continental crust) running into Eurasian plate (continental crust)


Himalaya Mountains

From space




B continental oceanic

b. Continental &Oceanic

SUBDUCTION


The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle is called

Subduction


Why does the oceanic crust sink below the continental crust
Why Does the Oceanic Crust sink below the Continental Crust?

Oceanic crust is MORE DENSE than Continental!


all from: http://www.geo.lsa.umich.edu/~crlb/COURSES/270


Volcanoes form where a convergent boundary occurs between oceanic crust and continental crust.



Andes Mts. From space plate (oceanic crust)

View looking south – ocean to continental


C oceanic oceanic

c. Oceanic plate (oceanic crust)&Oceanic

SUBDUCTION


Volcanoes also form where a convergent boundary occurs between oceanic crust and oceanic crust.



Following volcanic islands in the Pacific Ocean can show us where oceanic crust is being subducted by oceanic crust.


Review plate tectonics 3 divergent boundaries

Review Plate Tectonics #3 where oceanic crust is being Divergent Boundaries



1 sea floor spreading
#1 Sea floor spreading

Can you explain this diagram!?



This is a model of sea floor spreading at a divergentboundaryis called a mid ocean ridge.



: www.ocean.udel.edu

Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge?

The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball!


Divergence can also occur in continental crust!

Continental crust diverging from continental




Review plate tectonics 4 transform boundaries

Review Plate Tectonics #4 Transform Boundaries


Plates can also

slide past each other.

A transform boundary is a place where two plates slip past each other, moving in opposite directions.



Let s watch it in action

Let’s Watch it in action!

http://www.youtube.com/watch?v=ZxPTLmg0ZCw


Worktime
Worktime

TIER 2Reminders:

  • Make sure you are following the rubric!

  • Typed or written in blue/black ink

  • If you want me to look at it, I will!

  • Model=you should have three

  • Script=should be at least two pages

  • Let you me know if you need help!!!!!!!!!!


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