Tectonic Hazards

What are the tectonic plates?

• North and South America

• Indo-Australian plate

• Eurasian plate

• Pacific

• Antartic

• Africa

• Nazca

What are the types of tectonic plate ( explanation)?

• Constructive - 2 continental plates( or Oceanic) move apart due to convection currents, creating a gap for magma to rise through and solidifying to create a crust. Volcanos are formed and earthquakes can happen due to the friction between plates.

• Destructive-convection currents cause plate to move together, the conetinenatal and oceanic plates move towards each other the continental sinks under the oceanic as it is heavier oceanic plate melts under continental causing magma to escape causing earthquakes and volcanic eruptions.

• Conservative- 2 continental plates, convection currents in the mantle cause plate movement they slide the same way or different ways with different speeds causing friction making the plates get stuck so pressure builds when plate slip pressure is released causing earthquakes.

• Collison- 2 continental plates moving towards each other by convection currents making plates move making them fold upwards creating mountains sometimes earthquakes and NEVER volcanos.

What is Ridge, Pull, Slab, Push?

• The ocean ridge pulls and forms a slab which pushes back out. At the constructive plate margin ocean ridges form as magma hardens slightly higher than the crust around it as it cools it becomes denser as gravity drags it down, which drags the plate with it. At the destructive plate margin it cools whilst sinking dragging the plate with it.