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The Earth’s Core
Pages 12-13 (Inside Earth)
do scientists study the Earth?
use indirect observation (instruments & technology)
Waves – shock waves produced by the energy of the earth (earthquakes)
- Two types
of seismic waves: S-waves and P-waves
– instrument that records the two types of waves that penetrate the
earth’s interior and return to the surface
two waves behave differently when they ‘hit’ different structured
waves do not move well through liquid and S waves stop completely.
is the Earth’s core made of?
Inner Core- P-waves speed up so it is a solid.
Temperature of 5000°C
Made up of the elements Iron and Nickel
It is solid due to the enormous pressure
of the Earth.
Magnetic property comes from the iron in
Outer Core-P-waves slow down and S waves
disappear so it is a liquid
Also made of the elements Iron and Nickel
Temperature ranges from 2200°C to
gives Earth its magnetic property?
- The movement of the liquid (iron and
nickel) in the outer core create a magnetic field
- The planet acts as a giant magnet
through the North and South poles
- It also creates a magnetic shield around
the Earth – this is part of the atmosphere called the magnetosphere
- A compass will always point to the North
pole because of the magnetic property of Earth