Natural Disasters Flashcards
What are the 2 types of earths crust?
Oceanic crust and Continental crust.
What’s the earth’s structure, starting from the centre?
Inner core
Outer core
Mantel
Crust
What’s Oceanic crust?
A type of the earth’s crust which is a thin layer of heavy rocks.
What’s Continental crust.
A type of the earth’s crust, made of light rock, forming continents.
Where do most earthquakes occur?
Ring of fire -
Pacific Ocean
What are constructive plate margins?
Where oceanic crust melts and is pulled apart to form volcanoes.
What’s a destructive plate margin?
When the oceanic crust is being pushed under the continental crust and the plate melts, also forming an ocean trench and volcanoes.
What’s a conservative plate margin?
When 2 plates are moving alongside each other in opposite directions, causing land displacement, shock waves and earthquakes.
What’s a collision plate margin?
When 1 plate is moving downwards and it pulls down another plate with it, forming mountains. If 1 plate pings back up, it will cause an earthquake.
What are seismic waves?
Stored energy which has been released in an earthquake.
What’s magnitude?
The amount of energy given by an earthquake.
What causes earthquakes?
Large masses of rock are pushed into each other and pressure builds up until it can’t take anymore and it’s released.
How are earthquakes measured?
On the Richter scale.
What’s the sign of a tsunami?
The sea has gone very far out.
Is Indonesia a LEDC or an MEDC?
LEDC
