Environmental-Seismic activity

• Which are the Earth's layers?

  The crust

  The mantle

  The outer core

  The inner core
• The crust


  It is where we live. It is made of rock.
• The Mantle


  The widest section of the earth and is made out of molten rock which creates convection currents which cause plates to move.
• The outer core


  Made out of a liquid layer and consists of iron and nickel.
• The inner core


  It is the densest place inside the earth as there is extreme pressure. It is solid.
• What are the two types of crust?

  Oceanic crust

  Continental crust
• What is the difference between the oceanic and continental crust?

  Oceanic- Thin, young and heavier

  continental- Thick, very old, light and floats
• What are convection currents?

  They are the circular movements in the mantle which cause the plates to move
• What are plate tectonics?

  This refers to how the earth is divided into pieces called plates.
• What is a plate boundary?


  It is the edge where two plates meet and where most volcanos and earthquakes occur.
• What are the different types of plate boundaries?

  Divergent (destructive), convergent (constructive), transform, collision zones
• what is a constructive plate boundary?


  When two plates move away from each other and a gap is created which is filled with magma. This creates new crusts and new land is formed. example Iceland was formed this way.
• What is a destructive plate boundary?

  When an oceanic plate hits a continental plate it will sink beneath it since it is heavier. as it sinks earthquakes occur and magma will rise to the surface creating a number of volcanos call the volcanic arc.
• What are collision zones?

  When two continental plates hit each other since they are of the same density they are uplifted to form mountains. example the Himalayas