elective geography secondary 3 express (new)- plate tectonics 5

armanalluwie.blogspot.com

+

Elective Geog (New)Secondary 3 EWeek 6: Living with Tectonic Hazards

2+Lesson Outcomes

By the end of the lesson, we will be able to describe the characteristics of fold mountains describe the characteristics of landforms and

phenomena associated with converging continental and oceanic plate boundaries

armanalluwie.blogspot.com

3

http://www.youtube.com/watch?v=7gXixxYKM80

4+Fold Mountains

Formed when layers of rocks are compressed and folded

Young – less than 100 million years old

Old- 270- 400 million years

armanalluwie.blogspot.com

5

armanalluwie.blogspot.com

6

7+Fold Mountains

Formed when layers of rocks are compressed and folded

Found at Convergent plate boundaries

Common in sedimentary rocks

armanalluwie.blogspot.com

1 2

3

9+Fold Mountains

Folding When compressional force creates immense pressure

which causes the layers of rocks to buckle and fold

Anticline (Upfold)

Syncline (Downfold)

Fracture Formed when increasing compressional force on one

limb of a fold causes rocks to buckle

Limb moves forward to ride over the other limb

armanalluwie.blogspot.com

armanalluwie.blogspot.com

11

+Distribution of Fold Mountains

+ 13

Converging:Continental- Continental

Fold Mountain Range

armanalluwie.blogspot.com

14

armanalluwie.blogspot.com

15

+

armanalluwie.blogspot.com

16

Converging:Oceanic- Continental

Denser Oceanic Platesubducts beneath the lessdense Continental Plate

Oceanic TrenchAt Subduction Zone

Fold MountainsOn Continental Plate

Magma rises through crusts giving rise to Volcanoes

Continental Plate buckles and folds

Solid mantle materialmelts and forms magma

+Converging:Oceanic- Continental

SundaOceanicTrench

Fold Mountains/Volcanoes

armanalluwie.blogspot.com

18

+TRANSFORM PLATE BOUNDARY

- Plates slide past each other

- A fault line is created

* Transform plate boundaries are also known as ‘conservative’ plate boundaries

+ LET’S WRECK IT!

+

+TRANSFORM PLATE BOUNDARY

- The movement results in the formation of a fault

- In the process, tremendous stress builds up and is eventually released, often in the forms of tremor and earthquakes

+

TURKEY

ISTANBUL

E.g. North Anatolian Fault, Turkey

How would the plate movement affect the two cities shown in time to come?

+

E.g. San Andreas Fault, USA

+

+ANDES

+