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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”


Tuesday october 23 rd

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


Tuesday october 23 rd

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


Tuesday october 23 rd

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


Tuesday october 23 rd

a. Continentalcrust to continentalcrust

Before collision

MOUNTAINS

Example: India-Asia

(Himalayas)

After collision

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


Tuesday october 23 rd

Eurasian plate

Indian plate

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


Tuesday october 23 rd

Himalaya Mountains

From space




B continental oceanic

b. Continental &Oceanic

SUBDUCTION


Tuesday october 23 rd

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!


Tuesday october 23 rd

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


Tuesday october 23 rd

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



Tuesday october 23 rd

Andes Mts. From space plate (oceanic crust)

View looking south – ocean to continental


C oceanic oceanic

c. Oceanic plate (oceanic crust)&Oceanic

SUBDUCTION


Tuesday october 23 rd

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



Tuesday october 23 rd

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!?



Tuesday october 23 rd

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



Tuesday october 23 rd

: 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!


Tuesday october 23 rd

Divergence can also occur in continental crust!

Continental crust diverging from continental




Review plate tectonics 4 transform boundaries

Review Plate Tectonics #4 Transform Boundaries


Tuesday october 23 rd

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!!!!!!!!!!