The Restless Earth Flashcards
What are the characteristics of an oceanic plate boundary?
Thin Relatively new Heavy Sinks into mantle Forms constantly at constructive margins
What happens at a constructive plate boundary?
The plates move apart
What happens at a destructive plate boundary?
The plates move towards each other
At a conservative plate boundary what happens?
The plates slide past each other
How’s is a composite volcano formed?
Two plates come together and the denser plate subsists under the other. The intense heat and pressure causes the plate to melt forming magma which rises to form a volcano.
What is a composite volcano?
Made up of ash and lava that’s erupted cooled and hardened into layers
The lava is usually thick and flows slowly. It hardens quickly to form a steep sided volcano
What is a shield volcanoes?
Made up of only lava
The lava is runny. It flows quickly and spreads over a wide area forming a low flat volcano
What is the case study for fold mountains?
The Andes in South America
Destructive plate boundary
Where are ocean trenches found?
At destructive plate boundaries
When did the Montserrat volcano erupt?
1995 and again in 1997
What is an earthquake?
Movement in the mantle due to convection current causing pressure in the plates and then there is a sudden release of the pressure to cause an earthquake
What is an epicentre?
Point on crust directly above the focus
What does the Richter scale do?
Measures the magnitude of a tremor on a seismograph
Goes from 1-9
What does the mercado scale do?
Measures the effects of earthquakes using a scale from I-XII
What is a tsunami?
Fast moving wave of displaced water
