tectonic hazards

• A destructive plate is when two plates collide (oceanic and continental) and the oceanic plate is forced underneath the other, in a process called subduction.
• A constructive plate boundary is when two plates pull apart (diverge) because of the convection currents in the mantle beneath. Magma rises up and forms new crust in the gap.
• At conservative boundaries, plates move past each other, friction and pressure build between the rough surfaces. Eventually, the plates break apart causing an earthquake.
• At collision plate boundaries, continental plates move into each other, pushing themselves upward forming fold mountains.
• The San Andreas fault, California is an example of a conservative boundary.
• Iceland is an example of a constructive boundary.
• Japan and the Tohoku earthquake are an example of a destructive boundary.
• The Himalayas are an example of a collision boundary.
• Subduction occurs when an oceanic plate runs into a continental plate and slides beneath it.
• The core is the centre of the Earth and is slip into 2 layers. The inner core is solid and the outer core is liquid.
• The mantle is made of semi-molten rock and surrounds the core.
• The crust is a very thin outer shell (10km - 70km thick).
• The crust is broken up into pieces called tectonic plates.
• Continental crust is thicker and less dense.
• Oceanic crust is thinner and more dense.