The Layers of the Earth

• Earth's surface


  The first layer called the crust
• Crust


  • Made up of several large and all plates
• Middle layer


  Called mantle
• Mantle


  The thickest layer of the earth and made of magma
• Centered layer


  Called core
• Core


  Divided into a liquid layer called outer core and a solid layer called inner core
• Movements of plates in the Crust

  Often accompanied by earthquake and volcanic eruptions
• Earthquake


  The shaking of the ground
• How earthquakes occur


  Crustal plates move towards or away from each other, causing nearby rocks to break and slide past each other
• Earthquake waves


  Waves of energy released when rocks break
• Seismograph


  An instrument that measures earthquake waves
• Types of earthquakes


  • Volcanic earthquakes
  • Tectonic earthquakes
• Volcanic earthquake


  Happens with a strong volcanic eruption
• Tectonic earthquake


  Caused by the movement of the earth's crust
• Earthquake magnitude


  Refers to the amount of energy released by an earthquake from its focus
• Earthquake focus


  The point in the ground where the earthquake originates
• VOLCANIC ERUPTION


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