Science test - Earth

• Earth


  A sphere with a diameter of nearly 13,000 km
• Main layers of the Earth

  • Crust
  • Mantle
  • Core
• Crust


  • Outermost layer of the Earth
  • We live on the surface of the Earth's crust
  • Made up of rocks
  • Thinnest layer
  • Varies in thickness from about 8 to 40 km
  • Earthquakes and volcanoes occur in the crust
  • Not one complete shell, made of different sections called tectonic plates
• Mantle


  • Thickest layer
  • Mostly made up of solid rock but can flow because of the high pressure and temperature
• Core


  • Mainly made up of iron and nickel
  • Divided into two parts: the outer core and the inner core
  • Outer core is a liquid layer
  • Inner core is solid
• The deeper you go under the Earth's surface


  The hotter it gets
• The inner core is around 5000oC
• The deeper you go into the Earth


  The pressure increases
• The pressure is caused by the weight of all of the earth above