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Allen's rule
name
An
ecogeographic
principle
broadly
stating
that
animals
adapted
to
cold
climates
have
relatively
short
limbs.
Specifically,
homeothermic
animals
in
hot
climates
have
low
volume-to-surface
ratios,
and
homeothermic
animals
in
cold
climates
have
high
volume-to-surface
ratios,
due
to
thermal
adaptation.
Allen County
name
Allen Parish
name
Port Allen
name
Van Allen radiation belt
noun
(astronomy,
physics)
Either
of
two
torus-shaped
areas
of
high-energy
charged
particles
which
partly
surround
Earth,
trapped
by
its
magnetic
field.
The
areas
are
characterised
by
intense
radiation.
When
the
belts
"overload",
particles
strike
the
upper
atmosphere
and
fluoresce,
causing
the
polar
aurora.
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