6th Grade- Plate Tectonics

8/11/2019 6th Grade- Plate Tectonics

1/40

9/12/14-Do Now- what do you think the

earths inner/outer core are made of ?

SWBAT: Understand the Earths

Structure


2/40

The Structure of the

Earth and PlateTectonics


3/40

Structure of the Earth

The Earth is made up of

3 main layers:

Core

Mantle

Crust

Inner core

Outer core

Mantle

Crust


4/40

The Crust This is where we live!

The Earths crust is made

of:

Continental Crust

- thick (10-70km)- buoyant (less dense

than oceanic crust)

- mostly old

Oceanic Crust

- thin (~7 km)- dense (sinks under

continental crust)

- young


5/40

What is Plate Tectonics?


6/40

If you look at a map of the world, you may notice that some of the

continents could fit together like pieces of a puzzle.


7/40

Plate Tectonics

The Earths crust is divided into 12 majorplates which are moved in various directions.

This plate motion causes them to collide, pullapart, or scrape against each other.

Each type of interaction causes acharacteristic set of Earth structures ortectonicfeatures.

The word, tectonic, refers to the deformation ofthe crust as a consequence of plateinteraction.


8/40

World Plates


9/40


10/40

What lies beneath the tectonic plates?

Below the lithosphere

(which makes up thetectonic plates) is the

asthenosphere.


11/40

Plate Movement

Platesof lithosphere are moved around by

the underlying hot mantle convection cells


12/40

9/15/14- Do Now: What are the

3 types of plate boundaries?

SWBAT: Understand the earths

structure


13/40

Divergent

Convergent

Transform

Three types of plate boundary


14/40

Spreading ridges

As plates move apart new material is erupted to

fill the gap

Divergent Boundaries


15/40

Age of Oceanic Crust

Courtesy of www.ngdc.noaa.gov


16/40

Iceland has a divergent

plate boundary running

through its middle

Iceland: An example of continental rifting


17/40

There are three styles of convergent plate boundaries

Continent-continent collision

Continent-oceanic crust collision Ocean-ocean collision

Convergent Boundaries


18/40

Forms mountains,e.g. European Alps, HimalayasContinent-Continent Collision


19/40

Himalayas


20/40

Called SUBDUCTION

Continent-Oceanic Crust Collision


21/40

Oceanic lithospheresubducts underneath thecontinental lithosphere

Oceanic lithosphere heats

and dehydrates as itsubsides

The melt rises formingvolcanism

E.g. The Andes

Subduction


22/40

9/16/14

Do Now: What are a few examples we see on earth that

are results of convergent boundaries

SWBAT: Understand the Earths Structure


23/40

When two oceanic plates collide, one runs over the

other which causes it to sink into the mantle forming

a subduction zone.

The subducting plate is bent downward to form a

very deep depression in the ocean floor called a

trench.

The worlds deepest parts of the ocean are found

along trenches.

E.g. The Mariana Trench is 11 km deep!

Ocean-Ocean Plate Collision


24/40


25/40

Where plates slide past each otherTransform Boundaries

Above: View of the San Andreas

transform fault


26/40


27/40

whats the connection?

Volcanoes and Plate Tectonics


28/40

Volcanism is

mostlyfocused at

plate

margins

Pacific Ring of Fire


29/40

- Subduction - Rifting - HotspotsVolcanoes are formed by:


30/40

Pacific Ring of Fire

Hotspot

volcanoes


31/40

Hot mantle plumes breaching the surface in the middle of

a tectonic plate

What are Hotspot Volcanoes?

Photo: Tom Pfeiffer / www.volcanodiscovery.com

The Hawaiian island chain are

examples of hotspot volcanoes.


32/40

The tectonic plate moves over a fixed hotspot

forming a chain of volcanoes.

The volcanoes get younger from one end to the other.


33/40

whats the connection?

Earthquakes and Plate Tectonics


34/40

As with volcanoes, earthquakes are not

randomly distributed over the globe

At the boundaries between plates, frictioncauses them to stick together. When built upenergy causes them to break, earthquakes

occur.

Figure showing

the distribution of

earthquakes

around the globe


35/40

Where do earthquakes form?

Figure showing the tectonic setting of earthquakes


36/40

smic waves


37/40

smic waves


38/40

Plate Tectonics Summary

The Earth is made up of 3 main layers(core, mantle, crust)

On the surface of the Earth are tectonicplates that slowly move around the globe

Plates are made of crust specifically-(lithosphere) and the asthenosphere

There are 2 types of platesContinental and Oceanic

There are 3 types of plate boundariesDivergent, Convergent and Transform

Volcanoes and Earthquakes are closely linked to the margins of thetectonic plates


39/40

Heat Transfer on Earth


40/40

Closer look at Plate tectonics

http://youtu.be/KCSJNBMOjJs?t=8m22s
http://youtu.be/KCSJNBMOjJs?t=8m22shttp://youtu.be/KCSJNBMOjJs?t=8m22s

6th Grade- Plate Tectonics

Documents