Earthquakes

• Earthquakes occur at Plate margins
• 
• At Destructive plate margins - pressure of the subducting and melting plates are release and cause a powerful earthqake
• At Constructive boundaries - tend to be less severe The friction cause by the plates moving apart causes an earthquake
• At Conservative plate margins - greater strength, the plates slide past each other and stick for periods of time which causes stress and pressure to build. The release results in an earrthquake

The Richter scale - Every time the scale increases by 1 it means the volcanos strength has increased by 10.

The Mercalli Scale -

I - barely felt

V - felt by almost eveyone people sleeping are awakened

VII - considerable amount of damage to weak structures , most people run outside

X - Few structures survive, most foundations destroyed, avalanches flooding ect.