Restless Earth Flashcards
What is the focus?
The term used to describe where the earthquake first began.
What is the difference between a continental and an oceanic crust?
A continental crust is thicker and les dense whereas a oceanic crust is thinner and more dense.
What is the rictor scale?
The scale used to find magnitude of an earthquake.
How do tectonic plates move?
The core heats up the molten rock in the magma causing it to lose density and rise, closer to the crust the magma cools and becomes more dense causing it to fall again, making the molten rock pull the plates.
What happens at a constructive plate boundary?
Convection currents in magma cause played to be pulled apart causing magma to rise to the surface causing a volcanic ridge (sheild volcano)
What happens to a destructive plate boundary?
The continental crust and the oceanic crust join together at a plate margin, because the oceanic plate is thinner and more dense, it is forced under the continental crust.
What are the four main layers of the earth?
Crust
Mantle
Outer core
Inner core
What are the different parts of the mantle?
Solid upper mantle
Semi liquid lower mantle
What is a constructive plate boundary?
What’s two plates either slide in opposite directions and rub against each other or two plates that are going in the same direction but one is moving faster than the other
How is a tsunami formed?
When an earthquake or volcano eruption happens in the sea causing all the water on top of this area to rise up. This creates two blocks of water to move in opposite directions as judge waves.
What is an epicentre?
The point on the earths surface directly above the focus
What are the four main layers of the earth?
Crust
Mantle
Outer core
Inner core
What are the different parts of the mantle?
Solid upper mantle
Semi liquid lower mantle
What is a constructive plate boundary?
What’s two plates either slide in opposite directions and rub against each other or two plates that are going in the same direction but one is moving faster than the other
How is a tsunami formed?
When an earthquake or volcano eruption happens in the sea causing all the water on top of this area to rise up. This creates two blocks of water to move in opposite directions as judge waves.
