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0 / 60 seg.
Which element is alloyed with steel to make control rods for Nuclear reactors?
B
_
R
_
N
(
B
_
R
_
N
C
_
R
B
_
D
_
_
L
S
_
_
S
_
D
)
Clue
WESTERN APPROACHES
BORON (BORON CARBIDE ALSO USED)
COAL & LIMESTONE LIMESTONE & COAL
BROKEN ARROW
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