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☆☆☆☆☆the mantle and core are composed of different material
P waves refract as they travel through Earth. The shadow zone exists because of seismic waves. The shadows show when the earth spins around.
The inner core
Wandering with no pattern
Comparing the composition of the crust to other bodies in the solar system.
The iron nickel core has been determined to actually exist from the examination of meteorites, from the gravitational field of Earth, and from the Earth's density in comparison to its volume.
refraction refraction
compass magnets can be deflected by earths magnetic field or other permanent magnets
Samples of Earth's crust contain less iron than found in meteorites, and iron is a comparatively heavy element that would have sunk into the planet when it was being formed.
Reverse
Its Thrust!
The continental crust is up to 70 km thick.
Tidal heating supports the dynamo theory. Magnetized lunar rocks and asteroids are used for evidence of this.
http://phys.org/news/2012-10-evidence-dynamo-asteroid.html
Earth's outer core contains liquids that conduct electricity.
Earth's outer core is a liquid. Earth's core contains mostly iron and nickel.
magnetic stuff...
