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When the sample of sulfur freezes, crystals
start forming in many places at the same
time. These crystals then grow into each
other. The final lump is made of lots of
interlocking crystals.
Does this happen when lead freezes?
Metal objects.
Just like the lump of lead, all metal objects are lumps
of interlocking crystals. The size of the crystals can make
a big difference to the properties of the object. Small
crystals
make it hard but brittle.
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