Transcript Living in an active zone

Living in an active zone
Revision lesson
Why are plate margins hazardous?
• What are the plate margins and how do plate
movement generate a variety of landforms?
• What are the primary and secondary hazards
associated with volcanoes and earthquake
zones?
• Why do people continue to live in hazardous
zones?
The structure of the earth…..
• THINK ABOUT
WHAT THIS IMAGE
HAS TO DO WITH
THE EARTHS
STRUCTURE?
• YOU HAVE ONE
MINUTE TO SEE IF
YOU CAN COME UP
You will be selected at
WITH AN ANSWER
random to share your
answer with the class!!  • YOU MUST USE THE
WORDS ;
Core
Mantle
Crust
Plates and Plate Boundaries
3
7
W
Y
Z
5
1
8
X
6
2
4
Test yourself –
Name the plates 1 – 8 + Type of margins W-Z
Destructive plate boundaries
• Think about the direction that these plates
move in….one of you will be selected at
random to come to the front of the class to
mime the motion of a destructive plate
boundary!
• No helping
• No shouting out
What can you remember?
Match the letter with the number!
2
1
A Oceanic
crust
3
4
B Continental
crust
c. Volcanic
arc
d.
Trench
What can you remember?
Match the letter with the number!
A Oceanic
crust
B Continental
crust
c. Volcanic
arc
d. Trench
What happens at the destructive
margin?
1.
As the pressure is released we get earthquakes.
2.
Where plates move together, the denser oceanic
crust slips down into the mantle under the
continental crust.
3.
An oceanic trench is formed on the sea bed.
4.
Molten magma is forced to the surface where we
get volcanoes eventually building a mountain range.
5.
This movement builds up a large amount of pressure
between the two plates.
6.
The oceanic plate melts. This is known as the zone
of subduction.
Activity
Put these in the
correct order !
Answers:
Can you
remember
what case
study we
used for
this?
The Andes
2
6
3
5
4
1
Constructive plate boundaries
• Think about the direction that these plates
move in….one of you will be selected at
random to come to the front of the class to
mime the motion of a Constructive plate
boundary!
• No helping
• No shouting out
What can you remember?
Match the letter with the number!
1
2
3
4
A. Sea floor
spreading
c.
Magma
b. Midoceanic rige
d. Oceanic
crust
Strato and shield Volcano
A
1. layers of
ash and
lava
2.
Constructive
margin
Strato
Shield
3. Destructive
margin
4. High
summit
5. Low
height
B
6. Steep
gradient
7. Gentle slopes
8. Wide profile
9. Explosive
eruptions
10. Runny lava –
spreads easily
Can you
remember
what case
study we
used for
this?
Iceland
Primary or secondary hazards of a
volcanic eruption?
A. Primary
B. Secondary
7. tsunamis
1. Lava flow
2. lahars
3. landslides
4. Pyroclastic
flow
5. Ash and
tephra falls
6. Volcanic
gases
Primary or secondary hazards of a
volcanic eruption…answers 
A. Primary
B. Secondary
7. tsunamis
1. Lava flow
2. lahars
3. landslides
4. Pyroclastic
flow
5. Ash and
tephra falls
6. Volcanic
gases
Primary or secondary hazards of
an earthquake?
A. Primary
1. Ground shaking
3. tsunami
B. Secondary
2. landslides
4. Soil
liquifaction
Primary or secondary hazards of
an earthquake?
A. Primary
1. Ground shaking
3. tsunami
B. Secondary
2. landslides
4. Soil
liquifaction
Why do people live in hazardous
zones?
You have 2 minutes to come up with as
many reasons as possible to explain why
people live in risky areas! GO!
Fertile soil
Geothermal
energy
No choice
Unwillingness to
move
Tourism
How can the risks associated with
volcanic and earthquake zones be
reduced?
• How are volcanoes monitored and what
does this tell us about their state?
• How might the effects of volcano eruptions
and earthquakes be reduced in MEDCs
and LEDCs?
Answers:
Short term or long
term responses?
1. T
True or false?
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
F
F
TAttempt the paper ‘true or false’ quiz
F
F
T
F
F
T
T
F
Super volcanoes!
• Watch the video clip (in lesson folder)
• What might happen in the future –
Yellowstone, USA
http://www.youtube.com/watch?v
=1Vn6kxfD3Ek&feature=related