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Earthquakes and Volcano's (Types of plate movement (Collision zone-…
Earthquakes and Volcano's
Convection currents
Converge is when plates move together
Diverge is when plates move apart
Types of plate movement
Collision zone- plates collide
Transformation (sliding) - plates move alongside each other forming a fault line eg San Andreas
Spreading zone when two plates move in opposite directions
Subduction Zones - is when a denser OCEANIC plate collides with a less dense continental plate
Types of waves
First - The primary or P waves
Second - The shearing or S wave
Third - The last wave or L wave, this one causes the most damage
Earthquakes mostly occur along the edge of the oceanic and continental plates.
The focus is the point within the earth where seismic waves originate.
Epicentre - is on the earth surface directly above the focus point
Seismic graph is an instrument used to detect and record earthquakes
Viscosity - The state of being thick and sticky
Dormant = asleep or waiting to erupt
Extinct = not going to erupt again
Volcanic Flows - lahar = mudflow that flows down like river collecting mud and debris along the way
Pyroclastic flow = fast moving current of gas, ash and rock, very hot