Natural Hazards Flashcards
Which plate boundaries causes earthquakes?
Destructive, collision and conservative.
What is a conservative plate boundary?
Where two plates slide past each other in different directions or in the same direction at different speeds.
What is a constructive plate boundary?
Where two plates move apart from each other.
What is a collision plate boundary?
Where two plates are pushing together.
What is a destructive plate boundary?
When the oceanic crust is pushed under the continental crust because it is heavier and denser.
What do you often find on a destructive plate boundary?
Volcanoes and ocean trenches.
What can often be found on a collision plate boundary?
Fold mountain.
What is the focus?
The place inside the earth from where the pressure is released.
How is a vocano formed?
1) Magma rises through gaps in the crust
2) Pressure builds up inside earth
3) Pressure released through plate movement
4) Magma explodes to the surface
How are earthquakes measured?
On the richter scale using a seismometer.
How is an earthquake caused on a destructive plate boundary?
1) Oceanic plate is pushed under the contiental plate
2) They get stuck and pressure builds up
3) Eventually one plate slips and the stored energy is released in shock waves
What is the epicentre?
The point on the earths surface above the focus.
Which plate boundaries do volcanoes form on?
Destructive and constructive.
What plate boundary causes fold mountains?
Collision.
On what plate boundaries can you find volcanoes?
Destructive and constructive.
