Layers Of The Earth ( Note Form)

• Unfortunately, I cannot post my mind map here, so this is the note form
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• Layers Of The Earth
• The Core
• Thickness: 2900km
• Made up of two layers: Inner and Outer
• Dense ball of iron and nickel
• Rotation of inner core round the outer core causes magnetism.
• 1/3 of earth's mass, 1/6 of earth's volume
• Convection currents happens here when current is heated by core and rises to the crust, when it rises to the crust, it cools and falls, then the cycle repeats
• The Crust
• Two types of crust: Continental/Oceanic
• Contains substances and minerals within
• 1/250 of the earth's mass
• Has tectonic plates within the crust
• If tectonic plates touch, earthquakes happen
• Made up of rock and loose material
• The Mantle
• Has two layers inner and outer
• Function is to separate them
• About 2/3 earth's mass, 5/6 of the earth's volume
• Distance: 2900 km thick  Average Temp: 3000'C
• Outer Core
• Temp:4000-5000 C
• contains iron, nickel and 10% sulphur and oxygen
• The inner core rotation around it causes the earth's magnetism.
• 2890km-5150km from surface
• Outer Mantle
• Thinner than inner mantle
• Thickness: 10km-300km
• Temp: 1400-3000
• Made up of tough liquid rock with different densities ( made up of iron/magnesium silicates)
• Inner Core
• Distance from surface is 5150km-6370km
• About 5000-6000 C 
• Consists of iron, nickel and a few other elements
• High pressures makes it a solid
• Rotation round the outer core causes the earth's magnetism 
• Inner Mantle
• Thickness is 300km-2890km
• Average temp of 3000
• Made up of solid rock due to high pressure and temp.
• contains sulphides and oxides of silicon and magnesium