What is the place where tectonic plates meet called?
Plate boundries
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What are the properties of a destructive plate boundary?
-Where oceanic and continental plates are moving together -The denser oceanic plate is forced down into the mantle -This often creates volcanoes and ocean trenches.
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What is a ocean trench?
Very deep sections of the ocean floor where the ocean plate goes down
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What are the properties of a constructive plate boundary?
-Two plates are moving away -magma rises from the mantle to fill the gap. -it cools to create new crust
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What are the properties of a conservative margin?
-Two plates are moving sideways past each other, or moving the same direction but at different speeds. -crust isn't created or destoyed
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Continental crust is...
Thicker and less dence
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Oceanic crust is...
thinner and more dences
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What happens to the sedimentary rocks when tectonic plates collide?
They are folded and forced upwards to create mountains
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Where are fold mountains found?
At destructive plate boundary's
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What type of plate margins do earthquakes occur at?
All 3, Destructive, Constructive and Conservative plate margins
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How do earthquakes occur at destructive margins?
Tension builds up when one plate gets stuck as its moving down past the other into the mantle
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How do earthquakes occur at constructive margins?
Tension builds along cracks within the plates as they move away from each other.
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How do earthquakes occur at conservative margins?
Tension builds up when plates that are grinding past each other get stuck
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After the tension gets to much what happens at the plate margins?
The plates eventually pass each other sending out shock waves. This is an earthquake.
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Where is the focus of an earthquake?
The point in the earth where the earthquake starts. (at the bottem)
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Where is the epicentre of an earthquake?
The epicentre is the point directly above the focus (on the earth's surface)
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What does the Richter scale measure?
The amount of energy released by an earthquake (the magnitude)
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What does the Mercalli scale measure?
The effects of an earthquake.
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The Richter scale goes from..
1 and has no limit
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The Mercalli scale goes from..
1-12
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Impacts of an earthquake are more severe in poorer countries why is this?
loq quality houses are less stable and there is more in LEDC. LEDC's dont have much money to prepare and protect. Health care is often worse in LEDC
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Why do people continue to live in areas where earthquakes happen?
1) They have always lived there 2) They're employed in the area 3) They're confident of support from there government. 4) They don't think a bad earthquake will happen
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The damage earthquakes cause can be reduced by which 5 ways?
1) Prediction 2) Building tecniques 3) Planning 4) Education 5) Aid
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Other cards in this set
Card 2
Front
What is the mantle made out of?
Back
Semi-molten rock
Card 3
Front
What is the place where tectonic plates meet called?
Back
Card 4
Front
What are the properties of a destructive plate boundary?
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