1. Plate boundaries compared
Objective: To be able to draw a diagram,
describe the features and explain the
processes occurring at each plate boundary

2. 1) Describe the distribution of plate boundaries (3 marks)
2) Identify the type of plate boundary or boundaries found between:
a) The African and the Eurasian plate
b) The Indo Australian plate to the east of India and the Eurasian plate
c) The Eurasian plate and the North American plate
1 mark for each correct answer for question 2

3. Peer Assessment
• 1) The distribution of plate boundaries is very
uneven (1 mark). However, they are often
found on the edge of continents (1 mark) e.g.
North and South American (1 mark) or in the
middle of the ocean (1 mark) e.g. the mid
Atlantic (1 mark).
• 2) (a) Destructive ( 1mark)
• (b) Collision zone (1 mark)
• (c) A constructive boundary (1 mark)

4. Plate Boundaries Compared
Conservative margin

5. Conservative
plate boundary
http://whs.moodledo.co.uk/file.php/1365/EarthSystems/Earth%20Systems/Transform%20faults%20in%20California%20and%20Turkey.swf

6. Plate Boundary and Explanation Earthquakes Volcanoes
Example
Conservative •Plates slide past High magnitude • None
each other = Crust earthquakes
San Andreas fault- neither created or
North American destroyed because
and Pacific plates no magma or
(sliding past each subduction
other in the same •Friction between
direction) plates = extreme
stress builds in
crustal rocks when
released =
earthquake
•Longer period of
movement = more
stress build up so
when released =
more energy
significant
earthquake

7. Constructive plate
boundary
f
http://www.youtube.com/watch?NR=1&v=t-ctk4KR-KU

8. http://www.youtube.com/watch?v=ep2_axAA9Mw&NR=1
Destructive plate
boundary

9. Collision
Zone
http://whs.moodledo.co.uk/file.php/1365/EarthSystems/Earth%20Systems/Collision%20Zones.swf

10. Tasks
• Complete the rest of the table using p14
Purple Book and p14 Green Book

11. Plate Boundary Explanation Earthquakes Volcanoes
and Example
Constructive •New basaltic material rises • Low magnitude Shield Volcanoes not
to the surface forcing earthquakes very explosive or
•Iceland on the oceanic plates apart maximum 6 on dangerous
mid-Atlantic •Hot magma is able to fill Richter Scale Erupt basic lava and
ridge the the “gap” creating new occur in fissures
Eurasian and crust. (cracks in the crust)
North American •As magma continues to
plates are pulling build up new mountain
apart ranges form under sea =
mid-ocean ridge
•Magma continues to rise
until eventually above sea =
volcanic island

12. Plate Boundary and Explanation Earthquakes Volcanoes
Example
Destructive •Oceanic crust The highest Very explosive and
destroyed magnitude dangerous
Andes Mountains in •Oceanic plate earthquakes volcanoes with
Peru and Chiles subducts under less recorded occur here steep sides called
where Nazca dense continental composite cone
oceanic plate is plate forming fold volcanoes
subducted under mountains in the Erupt andesitic lava
the continental process
South American •Magma rises
plate through weaknesses
melting crust
forming volcanoes

13. Plate boundary and •Processes Earthquakes Volcanoes
Example
Collision Zone •Two continental Very high None because no
plates moving magnitude material is
Himalayas towards each other earthquakes subducted
Indian and Eurasian •Same density so no
continental plate subduction occurs
crash into each this cause the crust
other to buckle and fold
creating fold
mountains
• No volcanoes
occur here as
subduction does not
occur
•Crust neither
formed or
destroyed