Tectonic theory

• What plate is this?

  Destructive plate

  
• What plate is this?

  Constructive plate

  
• what plate is this?

  Conservative plate

  
• What two plates are used in destructive plate margins?

  Oceanic and continental plates
• How are destructive plate margin volcanos formed?

  1)As the oceanic and continental plates collide the oceanic plate subducts because it is denser than the continental plate

  2)The plate sinks into the mantle and melts to form magma

  3) The pressure of the magma builds up and begins to build

  4) The magma escapes through weakness in the rock

  5)This creates a composite volcano
• How are shield volcanos formed at a constructive plate margin?

  1)At a constructive plate the two plates begin to move apart

  2)When this happens magma rises through the gap

  3) This creates a shield volcano

  4)The movement of the plates can also cause earthquakes
• How do earthquakes happen at conservative plate margins?

  1)Two plates move past eachother at different speeds

  2) as the plates move friction occurs because they stick and slip

  3) pressure begins to build up

  4) When that pressure is released it sends out huge amounts of energy causing an earthquake
• What is the ring of fire?

  A group of volcanos located along the plate margin of the pacific plate.
• The inner core is in the centre and is the hottest part of the Earth. It is solid and made up of iron and nickel with temperatures of up to 5,500°C.
• The outer core is the layer surrounding the inner core. It is a liquid layer, also made up of iron and nickel.
• ]The mantle is the thickest section of the Earth at approximately 2,900 km. The mantle is made up of semi-molten rock called magma.
• The crust is the thinnest layer of the Earth at around 6km deep. It is composed mainly of granite and basaltic rocks.