Transcript Earth\'s magnetic Field Notes.ppt

Earth’s Magnetic
Field
Earth’s Magnetic
Field
• Vital to life on Earth
• Due to the Iron core
• Protects us from
cosmic rays
• Prone to reversal
Cosmic Rays
• High energy, fast
moving particles
from the Sun and
outside the solar
system
Cosmic Rays
• Hit upper
atmosphere and
create gamma rays
• One cosmic ray can
create hundred of
gamma rays
Cosmic Rays
• Gamma rays can
__________
materials
• This can cause
damage to tissues
and ________
Cosmic Rays
• Luckily, the Earth’s
magnetic field
deflects _________
particles, like cosmic
rays, along its lines
of force towards the
_______
The Aurora
Borealis
QuickTime™ and a
Sorenson Video 3 decompressor
are needed to see this picture.
The Aurora
Borealis
• Caused by particles,
ionised by cosmic
rays, recombining
with electrons and
emitting light
QuickTime™ and a
Sorenson Video 3 decompressor
are needed to see this picture.
Earth’s Magnetic
Field
Earth’s Magnetic Field (p56)
• Has lines of
_______ and
_______ like any
magnet
• Caused by _______
in the Earth’s _____
core