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i+.
E
Bubbles start to overflow out
of
the volcano crater
just
like a volcanic eruption(Fig.4)l
Throw contents away in right place after
the
volcanic reaction, clean the
model
with plenty
of
water.Dry and
repeat.
L
fi
NOTTCE:
The above chemicals are classified
as
Hazardous Materials. Please observe the following
statements(Risk and Safety advice).
Citric
acid(CoHroOa
CAS Number
77-92-9,
EINECS Number 2010691):
R36:
lrritating to eyes.
R37:
lrritating to respiratory system.
R3g:
lrritating to skin
Sodium bicarbonate
(N"HCOa
CAS
Number
144-55-8,
EINECS Number 2056338):
R34: Causes burns. S24: Avoid contact with skin. S25: Avoid contact with eyes.
Storage of
chemicals:
Avoid direct sunlight. Keep away from wet
or
high humidity.Do
not
mix
them in
a
closed container.
Now
you
have seen
a
simulated eruption,
but
what really
is a
volcano?
A
volcano
is
a
vent
in
the surface
of
the Earth through
which magma and associated gases
and
ash erupt; also, the form or structure,
usually conical, is produced
by
the
ejected material.
-4-
*
What is
a
volcano?
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