Earthquakes And Volcanos Flashcards
What is the inner core
Centre, hottest part of earth, iron nd nickel, 5500°c
What is the outer core
Surrounding the inner core, liquid layer made of iron nd nickel, similar temperatures
The mantle is??
Widest section of the earth , thickness of approx 2900 km. made from magma
The crust is
The outer layer , thin 0-60 km thick .
What is a constructive plate movement
Convection currents cause plates to move away from each other which can lead to volcanos
What is a destructive plate movement
When one plate is forced downwards beneath another
What is collisional plate movements
Two plates consisting of continental crust move together , it’s pushed upwards
What is conservative plate movements
where plates slide past each other in opposite directions, or in the same direction but at different speeds. Friction is eventually overcome and the plates slip past in a sudden movement. The shockwaves created produce an earthquake .
Describe the distribution
Plate boundaries particularly pacific plate
Example of conservative
San Andreas Fault, where the North American and Pacific plates are actually moving in the same direction, but at a different speed.
Example of destructive
Pacific plate moves towards Eurasian plate, Eurasian plate is bent
Positives of an eruption?
Provides valuable nutrients and good soil , high level of heat can provide geothermal energy attracts tourists
Monitoring a volcano
Seismometers as hundreds of small earthquakes r caused due to the magma rising
Causes of Japanese earthquake
A mag 9 earthquake Pacific plate nd Eurasian plate hadn’t moved in 200 years finally flicked up , sent water upwards Lasted 5 mins 10 billion tons of water Also liquefaction
Effects
20,000 dead or missing
590,000 in shelters
1.4 mill left without drinking water
