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The compass needles line up with the lines of the magnetic
The same magnetic field is generated when a current is
passed through a coil of wire
The Earth's dynamo
When a coil moves in a
magnetic field, a current is produced in the coil
This is the principal of the dynamo
There is a also a magnetic field around a coil carrying an
electrical current
Deep inside the Earth, the solid inner core and liquid outer
core move relative to one another
Electrical…read more

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These electrical currents produce the Earth's magnetic
An electrical current is a flow of electrical charge
Moving electric charges can be thought of as having
electric currents
Since an electrical current has a magnetic field associated
with it, so moving electrical chargers have magnetic fields
associated with them
Solar Flares
A solar flare is a violent explosion above the Sun's surface
A large amount of energy us released
Solar flares may only last up to 10 minutes but the five
out energy equivalent to…read more

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Cosmic rays
Cosmic rays, mostly from the sun can
interact with Earth's magnetic field
As they spiral around they lose energy
causing coloured light ­ aurora borealis
(the Northern Lights)
Extreme concentration of cosmic rays can
disrupt the National Grid, supply of
electricity, and it's satellite
Cosmic rays are not really rays at all;
instead they are a stream of particles
The particles are ionised atoms ranging from a single
proton up to an iron nucleus and larger
The most common cosmic ray is…read more

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Other stars
Supernova and their remnants
Distant galaxies
Cosmic ray particles are travelling very close to the speed
of light and have a lot of energy
The rays interact with Earth's magnetic field by spiralling
around the field lines
As a result there is a concentration of cosmic rats at the
North and South poles
On certain nights at high latitudes on Earth, shifting
patterns of light may be seen in the sky
These are the auroras
The bright lights are caused by cosmic rays…read more

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The moon
It is thought that two planet's collided
Then the heavier material forms the Earth (iron core)
And the lighter material forms a moon
Evidence for the origin of the Moon…read more

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Earth has a large iron core but the Moon does not
This is because the iron in the Earth had already drained
into the core by the time the collision happened
The debris blown out for both Earth and the other planet
came from their iron-depleted mantles
The iron core of the other planet melted on collision and
merged with Earth's core
The evidence supports the model:
The average density if the Earth us 5500kg/m while that
of the Moon is only 3300kg/m ; the…read more


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