Fold mountains and Ocean Trenches AQA Geography Year 10 Learning objectives Why fold mountains and ocean trenches form at destructive plate margins The difference between composite volcanoes which are associated with destructive plate margins and shield volcanoes which are associated with con ID: 780240
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Slide1
What landforms are found at different plate boundaries?
Fold mountains and Ocean Trenches
AQA Geography
Year 10
Slide2Learning objectives
Why fold mountains and ocean trenches form at destructive plate margins.
The difference between composite volcanoes which are associated with destructive plate margins and shield volcanoes which are associated with constructive plate margins.
Slide3Slide4Fold mountains
Young fold mountains (formed over last 65 million years) are the highest areas in the world.
All peaks over 7000m are in central Asia, including Mt Everest at 8,850m.
Young fold mountains include ranges such as the Himalayas, the Rockies, the Andes and the Alps.
Fold mountains are large mountain ranges where rock layers have been crumpled as they are forced together.
Slide5The Himalayas Mountain range, northern Nepal
Height
8,848 metres
Slide6The
Rockie
Mountains
USA and Canada
highest peak is
Mount Elbert
in
Colorado
at 4,401 m
Slide7The Andes
South America
Mount Aconcagua in
Argentina
has
a height of 6960 m
Slide8The Alps
The highest point is
Mont Blanc
At 4,807m
Slide9Ocean trenches
Ocean trenches are deep sections of the ocean, usually where an oceanic plate is sinking below a continental plate.
Compare the blue ocean trenches to the following map of tectonic plate margins.
Q1. At what type of plate margin do fold mountains and ocean trenches form?
Add the ocean trenches and fold mountains onto your blank maps of the world
Slide10Slide11What landforms are found at different plate boundaries?
Both fold mountains and ocean trenches result from plates
moving together
. If both landforms occur in the same area, they are found in association with
subduction
.
If fold mountains occur by themselves, they are in areas where
collision
is taking place.
Slide12Formation of fold mountains
Animation
Slide13Composite and Shield Volcanoes
Eruptions are frequent and non-violent
Layers of runny lava
(
low viscosity) with little ash.
Multiple layers of thick lava and ash
Low rounded peak
Steep slopes and narrow base
Eruptions infrequent but often violent
Wide base and gentle slopes
Slide14VISCOSITY
Viscosity
is the resistance a material has to change in form.
Low Viscosity
=
NOT
STICKY
=
Fast
flowing.
CREAM!
High Viscosity
=
STICKY
=
Slow
flowing.
TREACLE
!
Slide15Activities
1. Write five questions you would ask to find out about the contrasts between a composite and shield volcano.
2. Swap questions with a partner and answer their questions.
3. What were the good points about the questions you have just answered? How might they be improved?
Slide16Popocatepetl composite volcano in Mexico is on the Ring of
Fire!
Slide17Mauna Loa, Hawaii, is an excellent example of a shield volcano
Slide18What is happening here?
Which type of volcano would you associate with this activity and why?