Volcanoes are found and DESTRUCTIVE AND CONSTRUCTI
At destructive plate margins the oceanic plate moves down into the mantle, where it's melted and destroyed.
A pool of magma rises through cracks in the crust called vents.
The magma erupts onto the surface forming a volcanoe.
At constructive margins the magma rises up into the gap created by the plates moving apart, forming a volcanoe.
Some volcanoes also form over parts of the mantle that are really hot e.g. Hawaii.
When a volcanoe erupts, it emits lava and gases. Some volcanoes emit lots of ash, which can cover land, block out the sun.
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Earthquakes occur at ALL THREE TYPES
Earthquakes are caused by the tension that builds up at all three plate margins. DESTRUCTIVE, CONSTRUCTIVE AND CONSERATIVE.
The plates eventaully jerk past eachother, sending out shock waves, these are called an earthquake.
The shock waves spread out from the focus - the point in the Earth where the earthquake started, near the focus the waves are stronger and cause more damage.
The epicentre is the point on the surface just above the focus.
Earthquakes are measured on the ricter scale.
A magnitude 6 is ten times less powerful than a magnitude 7.
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