Paper 1: Naked Eye 1.3

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Crust

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4 Terms

1

Crust

Features: Solid layer composed of tectonic plates composed of iron, oxygen, silicon.
Thickness: 8km to 70km continental crust of granite over an 8km oceanic crust of basalt.
Temperature: Approx. 20°C

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2

Mantle

Features: Makes up 80% of the volume of the Earth, Rock is hot enough to melt but remains solid due to pressure. Upper and Lower mantle drive convention currents of semi-solid rock called magma.
Thickness: 2,900km
Temperature: 1,400°C – 3,000°C

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3

Outer Core

Features: Liquid iron and nickel, generates Earth’s magnetic field current.
Thickness: 2,900km thick
Temperature: 3,500-4,000°C

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4

Inner Core

Features: Hottest part of Earth, Sphere of liquid iron.
Thickness: 1,200km
Temperature: 5,000°C – 6,000°C

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