living in an active zone revision lesson. why are plate margins hazardous? what are the plate...
TRANSCRIPT
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 WITH AN ANSWER
• YOU MUST USE THE WORDS ;
Core Mantle Crust
You will be selected at random to share your answer with the class!!
Plates and Plate Boundaries
Test yourself – Name the plates 1 – 8 + Type of margins W-Z
1
2
3
4
5
6
7
8
W
X
Y 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!
A Oceanic crust
B Continental crust
c. Volcanic arc
d. Trench
h
as
vcjh
v
hasvcjhvfgndtfgndfgfgngfnn
12 3
4
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:2
6
3
5
4
1
Can you remember what case study we used for
this?
The Andes
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!
A. Sea floor spreading
b. Mid-oceanic rige
d. Oceanic crust
c. Magma
12
3
4
Strato and shield Volcano
A BStrato
2. Constructive margin
3. Destructive margin
6. Steep gradient
4. High summit
1. layers of ash and
lava
9. Explosive eruptions
5. Low height
7. Gentle slopes8. Wide profile
10. Runny lava – spreads
easily
Shield
Can you remember what case study we used for
this?
Iceland
Primary or secondary hazards of a volcanic eruption?
1. Lava flow
5. Ash and tephra falls
4. Pyroclastic flow
3. landslides
7. tsunamis
2. lahars
6. Volcanic gases
A. Primary B. Secondary
Primary or secondary hazards of a volcanic eruption…answers
1. Lava flow
5. Ash and tephra falls
4. Pyroclastic flow
3. landslides
7. tsunamis
2. lahars
6. Volcanic gases
A. Primary B. Secondary
Primary or secondary hazards of an earthquake?
1. Ground shaking 2. landslides
3. tsunami 4. Soil liquifaction
A. Primary B. Secondary
Primary or secondary hazards of an earthquake?
1. Ground shaking 2. landslides
3. tsunami 4. Soil liquifaction
A. Primary B. Secondary
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!
No choice
Fertile soil
Unwillingness to move
Geothermal energy
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?
Short term or long term responses?True or false?
Attempt the paper ‘true or false’ quiz
Answers:
1. T
2. F
3. F
4. T
5. F
6. F
7. T
8. F
9. F
10. T
11. T
12. 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