Tuesday october 23 rd
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Tuesday, October 23 rd. A collision between 2 pieces of continental crust at a converging boundary produces a: mid-ocean ridge Deep-ocean trench rift valley Mountain range. Tier 2 PT= Thursday. Welcome to Ms. Evans Cheer Camp. When I say transform you say Slide . Transform.

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Tuesday, October 23 rd

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Tuesday, October 23rd

A collision between 2 pieces of continental crust at a converging boundary produces a:

  • mid-ocean ridge

  • Deep-ocean trench

  • rift valley

  • Mountain range


Tier 2 PT=

Thursday


Welcome to Ms. Evans Cheer Camp


When I say transform you say

Slide


Transform


Transform


When I say Divergent you say

Apart


Divergent


Divergent


When I say convergent you say

Collide


Convergent


Convergent


The Continents Slow Dance

  • The plates are moving at a very slow rate of about one to ten centimeters per year.

  • In areas plates are moving together and others are moving apart.


Review Plate Tectonics #1What Causes plate Tectonics?!?

http://www.youtube.com/watch?v=0mWQs1_L3fA


Can you

explain

this

diagram?

Click here for a hyperlink to an animation of convection


Let’s Draw It out!


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


Even the Appalachian Mountains!


Folded mountains – notice the rock layers


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?

Oceanic crust is MORE DENSE than Continental!


  • Because one plate gets pushed under another, it is called subduction.

  • This is where volcanoes and trenchesform!

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


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


South American plate (continental crust) running into Nazca plate (oceanic crust)


Andes Mts. From space

View looking south – ocean to continental


c. Oceanic &Oceanic

SUBDUCTION


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


Aleutian islands of Alaska are volcanoes formed by oceanic crust converging with oceanic crust


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


Here is an great link for seeing where each type of boundary is located.

World of

Boundaries


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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